Title: Data Analysis Review
Course: quiz duplicate error

Q: Mr. Miyar asked his ninth grade students how many books they each read during the summer break. He then organized the data into a bar graph.

Summer Reading
[Image]

According to the bar graph above, how many students are in the class?
- 25 students (Add the frequencies for each bar to find the total number of sixth graders in the class. [Image])
- 28 students (Add the frequencies for each bar to find the total number of sixth graders in the class. [Image])
- 18 students (Add the frequencies for each bar to find the total number of sixth graders in the class. [Image])
- 22 students (Add the frequencies for each bar to find the total number of sixth graders in the class. [Image])
A: 25 students

Q: Mr. Miyar asked his ninth grade students how many books they each read during the summer break. He then organized the data into a bar graph.

Summer Reading
[Image]

From the above graph, how many ninth graders read between 7 and 9 books during the summer break?
- 3 students (The frequency on the vertical axis tells how many students read that number of books during the summer. The bar representing reading between 7 and 9 books has a frequency of 6, so 6 students read between 7 and 9 books last summer.)
- 4 students (The frequency on the vertical axis tells how many students read that number of books during the summer. The bar representing reading between 7 and 9 books has a frequency of 6, so 6 students read between 7 and 9 books last summer.)
- 6 students (The frequency on the vertical axis tells how many students read that number of books during the summer. The bar representing reading between 7 and 9 books has a frequency of 6, so 6 students read between 7 and 9 books last summer.)
- 7 students (The frequency on the vertical axis tells how many students read that number of books during the summer. The bar representing reading between 7 and 9 books has a frequency of 6, so 6 students read between 7 and 9 books last summer.)
A: 6 students

Q: The stem-and-leaf plot shows how many tickets were sold to the 7:15 showing of a movie over the past two weeks. On how many nights were 30 or more tickets sold?

Movie Tickets Sold
Stem | Leaf
2 | 5, 6, 9
3 | 2, 3, 4, 6, 9
4 | 0, 3, 5, 6
5 | 9, 9
 | 4 | 5 = 45
- 14 (Count the leaves representing 30 or more tickets sold. The correct answer is 11.)
- 10 (Count the leaves representing 30 or more tickets sold. The correct answer is 11.)
- 11 (Count the leaves representing 30 or more tickets sold. The correct answer is 11.)
- 13 (Count the leaves representing 30 or more tickets sold. The correct answer is 11.)
A: 11

Q: A scientist measured several densities and recorded them in a table, but he wants to record the data in a bar graph. The smallest density measured was 20 grams per cubic centimeter, and the largest density was 45 grams per cubic centimeter. If the densities are to be plotted on the vertical axis, which of the following scales is most appropriate?
- between 30 and 60 g/cm^3 (The most appropriate scale for the vertical axis is between 0 and 50 grams per cubic centimeter.)
- between 0 and 130 g/cm^3 (The most appropriate scale for the vertical axis is between 0 and 50 grams per cubic centimeter.)
- between 0 and 40 g/cm^3 (The most appropriate scale for the vertical axis is between 0 and 50 grams per cubic centimeter.)
- between 0 and 50 g/cm^3 (The most appropriate scale for the vertical axis is between 0 and 50 grams per cubic centimeter.)
A: between 0 and 50 g/cm^3

Q: The line graph shows the grade point average of a student at the end of each quarter this school year. During which quarter did the student’s GPA increase the most?

GPA Analysis
[Image]
- the second quarter (Look for the interval on the graph that shows the greatest increase. The student’s GPA increased the most during the third quarter.)
- the third quarter (Look for the interval on the graph that shows the greatest increase. The student’s GPA increased the most during the third quarter.)
- the first quarter (Look for the interval on the graph that shows the greatest increase. The student’s GPA increased the most during the third quarter.)
- the fourth quarter (Look for the interval on the graph that shows the greatest increase. The student’s GPA increased the most during the third quarter.)
A: the third quarter

Q: William is creating a circle graph to help him budget his monthly expenses. He figures that out of every $100 in monthly expenses, he spends $20 on utilities. Which of the following labels is most appropriate for this section of the circle graph?
- Monthly Expenses (Since this section represents the portion of the William’s budget spent on utilities, the correct label for the section should be Utilities. Also, since $20 out of every $100 is spent on utilities, it would be appropriate to include 20% in the label.)
- Utilities, 10% (Since this section represents the portion of the William’s budget spent on utilities, the correct label for the section should be Utilities. Also, since $20 out of every $100 is spent on utilities, it would be appropriate to include 20% in the label.)
- William’s Budget, 20% (Since this section represents the portion of the William’s budget spent on utilities, the correct label for the section should be Utilities. Also, since $20 out of every $100 is spent on utilities, it would be appropriate to include 20% in the label.)
- Utilities, 20% (Since this section represents the portion of the William’s budget spent on utilities, the correct label for the section should be Utilities. Also, since $20 out of every $100 is spent on utilities, it would be appropriate to include 20% in the label.)
A: Utilities, 20%

Q: What is the difference between the highest score earned and the lowest score earned on the Midterm Exam?

Midterm Exam Scores
Stem | Leaf
6 | 3, 5, 9
7 | 1, 2, 3, 4, 6, 9
8 | 1, 1, 3, 3, 4, 6, 9
9 | 3, 5, 5, 7
 | 8 | 3 = 83
- 31 (The highest score in the plot is 97, and the lowest score is 63. Subtract these numbers to find the difference. [Image])
- 97 (The highest score in the plot is 97, and the lowest score is 63. Subtract these numbers to find the difference. [Image])
- 34 (The highest score in the plot is 97, and the lowest score is 63. Subtract these numbers to find the difference. [Image])
- 63 (The highest score in the plot is 97, and the lowest score is 63. Subtract these numbers to find the difference. [Image])
A: 34

Q: According to the pictograph, how many points did Suzie score?

Points Scored
Jennifer | [Image] [Image] [Image] [Image] [Image] [Image] [Image]
Suzie | [Image] [Image] [Image] [Image] [Image] [Image] [Image]
Christopher | [Image] [Image] [Image] [Image] [Image] [Image] [Image]
Key: [Image] = 2 points
- 10 points (There are 7 basketballs next to Suzie’s name, and each one of them represents 2 points. So, Suzie scored [Image] points.)
- 14 points (There are 7 basketballs next to Suzie’s name, and each one of them represents 2 points. So, Suzie scored [Image] points.)
- 8 points (There are 7 basketballs next to Suzie’s name, and each one of them represents 2 points. So, Suzie scored [Image] points.)
- 7 points (There are 7 basketballs next to Suzie’s name, and each one of them represents 2 points. So, Suzie scored [Image] points.)
A: 14 points

Q: The table shows the times of 8 runners in the 110-meter hurdle race. What was the mean time that it took the runners to complete the race? Round to the nearest tenth if necessary.

110-m Hurdles
Runner | Time (seconds)
1 | 18
2 | 17
3 | 18
4 | 15
5 | 20
6 | 19
7 | 18
8 | 18
- 15.6 seconds (Divide the total number of seconds by the number of runners to find the mean. [Image])
- 18 seconds (Divide the total number of seconds by the number of runners to find the mean. [Image])
- 17.9 seconds (Divide the total number of seconds by the number of runners to find the mean. [Image])
- 20.1 seconds (Divide the total number of seconds by the number of runners to find the mean. [Image])
A: 17.9 seconds

Q: The ages of the students in a skydiving class are shown in the stem-and-leaf plot. What is the mode of the students’ ages?

Ages
Stem | Leaf
2 | 3, 4, 8
3 | 0, 0, 0, 1, 4, 8
4 | 1, 5, 8
5 | 0, 6
 | 6 | 8 = 68 years
- 26 years (The age that occurs most frequently is 30 years.)
- 32.5 years (The age that occurs most frequently is 30 years.)
- 30 years (The age that occurs most frequently is 30 years.)
- 33 years (The age that occurs most frequently is 30 years.)
A: 30 years

Q: What is the median temperature for the data shown in the table?

Temperature
(degrees Celsius)
29.8°C | 28.1°C | 28.5°C
29.7°C | 28.8°C | 28.7°C
28.8°C | 29.7°C | 28.7°C
- 28.6°C (Write the temperatures in order from least to greatest. The median is the middle value, or 28.8°C.)
- 28.8°C (Write the temperatures in order from least to greatest. The median is the middle value, or 28.8°C.)
- 29.1°C (Write the temperatures in order from least to greatest. The median is the middle value, or 28.8°C.)
- 29°C (Write the temperatures in order from least to greatest. The median is the middle value, or 28.8°C.)
A: 28.8°C

Q: Last week Bradley practiced his guitar for 25 minutes on Monday, 25 minutes on Tuesday, 35 minutes on Wednesday, 35 minutes on Thursday, and 20 minutes on Friday. What was the mean number of minutes that he spent practicing each day?
- 23 minutes (Find the sum of the minutes spent practicing last week. Then divide by the number of days. [Image])
- 31 minutes (Find the sum of the minutes spent practicing last week. Then divide by the number of days. [Image])
- 25 minutes (Find the sum of the minutes spent practicing last week. Then divide by the number of days. [Image])
- 28 minutes (Find the sum of the minutes spent practicing last week. Then divide by the number of days. [Image])
A: 28 minutes

Q: The bar graph shows how many new employees were hired at a manufacturing plant each month last summer.

Hiring Records
[Image] [Image]

In the above bar graph, what was the median number of employees hired per month?
- 11.8 employees (List the numbers of employees hired in order from least to greatest. The median is the middle number, or 12.)
- 9 employees (List the numbers of employees hired in order from least to greatest. The median is the middle number, or 12.)
- 15 employees (List the numbers of employees hired in order from least to greatest. The median is the middle number, or 12.)
- 12 employees (List the numbers of employees hired in order from least to greatest. The median is the middle number, or 12.)
A: 12 employees

Q: The bar graph shows how many new employees were hired at a manufacturing plant each month last summer.

Hiring Records
[Image] [Image]

Referring to the above bar graph, what was the mean number of employees hired per month last summer? Round to the nearest tenth if necessary.
- 13.6 employees (Add the number of new hires during the time period and divide by the number of months. [Image])
- 10.5 employees (Add the number of new hires during the time period and divide by the number of months. [Image])
- 11.8 employees (Add the number of new hires during the time period and divide by the number of months. [Image])
- 12 employees (Add the number of new hires during the time period and divide by the number of months. [Image])
A: 11.8 employees

Q: The table below shows the number of sales Kerri made last week. Based on these numbers, she claims to have had about 9 sales per day for the week. Explain why this claim might be considered inaccurate.

Kerri’s Weekly Sales
Day | Number of Sales
Monday | 4
Tuesday | 3
Wednesday | 9
Thursday | 7
Friday | 9
- The median number of sales of 9 is higher than the sales from most of the days. (The mean number of sales per day is 6.4, the median is 7, and the mode is 9. Choosing the mode as a measure of central tendency might be considered inaccurate since it is higher than the sales from most of the days. It is too high to be considered a good measure of central tendency.)
- The mode number of sales is 9, which is higher than the sales from most of the days. (The mean number of sales per day is 6.4, the median is 7, and the mode is 9. Choosing the mode as a measure of central tendency might be considered inaccurate since it is higher than the sales from most of the days. It is too high to be considered a good measure of central tendency.)
- The median number of sales is 7. (The mean number of sales per day is 6.4, the median is 7, and the mode is 9. Choosing the mode as a measure of central tendency might be considered inaccurate since it is higher than the sales from most of the days. It is too high to be considered a good measure of central tendency.)
- The mean number of sales is 6.4. (The mean number of sales per day is 6.4, the median is 7, and the mode is 9. Choosing the mode as a measure of central tendency might be considered inaccurate since it is higher than the sales from most of the days. It is too high to be considered a good measure of central tendency.)
A: The mode number of sales is 9, which is higher than the sales from most of the days.

Q: The table shows the number of incorrect answers given by nine students on a standardized test. Which of the following measures would make the number of missed questions appear as small as possible?

Student ID | Missed Questions
1 | 18
2 | 10
3 | 9
4 | 22
5 | 11
6 | 13
7 | 9
8 | 8
9 | 2
- median (The mean is 11.3, the median is 10, the mode is 9, and the range is 20. Since the mode has the smallest value, this is the measure that makes the rate of missed questions appear as small as possible.)
- mode (The mean is 11.3, the median is 10, the mode is 9, and the range is 20. Since the mode has the smallest value, this is the measure that makes the rate of missed questions appear as small as possible.)
- mean (The mean is 11.3, the median is 10, the mode is 9, and the range is 20. Since the mode has the smallest value, this is the measure that makes the rate of missed questions appear as small as possible.)
- range (The mean is 11.3, the median is 10, the mode is 9, and the range is 20. Since the mode has the smallest value, this is the measure that makes the rate of missed questions appear as small as possible.)
A: mode

Q: The Reliant Storage Company uses the following bar graph in their brochures to compare the volume of their sheds to the volume of a competitor’s shed.

Storage Shed Comparison
[Image] [Image]

Which of the following statements describes what is most misleading about the above bar graph?
- The vertical axis showing the volume of the sheds does not begin at 0. (The vertical axis, which shows the volume of each shed, begins at 200 instead of 0. This makes the bar representing the volume of the Reliant shed appear much larger than the bar representing the volume of an Ultra shed.)
- The labels on the horizontal axis are not accurate. (The vertical axis, which shows the volume of each shed, begins at 200 instead of 0. This makes the bar representing the volume of the Reliant shed appear much larger than the bar representing the volume of an Ultra shed.)
- The scale of the horizontal axis is not shown. (The vertical axis, which shows the volume of each shed, begins at 200 instead of 0. This makes the bar representing the volume of the Reliant shed appear much larger than the bar representing the volume of an Ultra shed.)
- The graph does not mention the kinds of materials used to build each shed. (The vertical axis, which shows the volume of each shed, begins at 200 instead of 0. This makes the bar representing the volume of the Reliant shed appear much larger than the bar representing the volume of an Ultra shed.)
A: The vertical axis showing the volume of the sheds does not begin at 0.

Q: The Reliant Storage Company uses the following bar graph in their brochures to compare the volume of their sheds to the volume of a competitor’s shed.

Storage Shed Comparison
[Image] [Image]

What invalid conclusion might a customer reach after reading the above bar graph in the brochure?
- The Reliant shed has about three times as much storage space as the Ultra shed. (The way the graph is drawn, the bar representing the volume of the Reliant shed appears to be about three times the size of the bar representing the volume of the Ultra shed. If a customer does not study the graph carefully, he or she might conclude that the Reliant shed has three times as much storage space as the Ultra shed.)
- The Ultra shed has about three times as much storage space as the Reliant shed. (The way the graph is drawn, the bar representing the volume of the Reliant shed appears to be about three times the size of the bar representing the volume of the Ultra shed. If a customer does not study the graph carefully, he or she might conclude that the Reliant shed has three times as much storage space as the Ultra shed.)
- The Reliant shed uses better materials than the Ultra shed. (The way the graph is drawn, the bar representing the volume of the Reliant shed appears to be about three times the size of the bar representing the volume of the Ultra shed. If a customer does not study the graph carefully, he or she might conclude that the Reliant shed has three times as much storage space as the Ultra shed.)
- The Reliant shed has about 100 cubic feet more space than the Ultra shed. (The way the graph is drawn, the bar representing the volume of the Reliant shed appears to be about three times the size of the bar representing the volume of the Ultra shed. If a customer does not study the graph carefully, he or she might conclude that the Reliant shed has three times as much storage space as the Ultra shed.)
A: The Reliant shed has about three times as much storage space as the Ultra shed.

Q: The line graph contains data on shoe sales at First Fitness over a 5-month period. Between which two consecutive months did shoe sales decrease the most?

First Fitness Shoe Sales
[Image] [Image]
- between August and September (Look for the interval on the graph that shows the greatest decrease in shoe sales. The sale of shoes decreased the most between June and July.)
- between July and August (Look for the interval on the graph that shows the greatest decrease in shoe sales. The sale of shoes decreased the most between June and July.)
- between June and July (Look for the interval on the graph that shows the greatest decrease in shoe sales. The sale of shoes decreased the most between June and July.)
- between September and October (Look for the interval on the graph that shows the greatest decrease in shoe sales. The sale of shoes decreased the most between June and July.)
A: between June and July

Q: The table shows the number of cars at a drive-in movie theater each evening last week. What was the mean number of cars each evening? Round your answer to the nearest tenth, if necessary.

Drive-in Customers
Evening | Number of Students
Monday | 37
Tuesday | 31
Wednesday | 35
Thursday | 41
Friday | 52
Saturday | 58
Sunday | 34
- 41.1 cars per evening (Find the total number of cars for the week and divide by the number of days. Round to the nearest tenth, if necessary. [Image])
- 40.6 cars per evening (Find the total number of cars for the week and divide by the number of days. Round to the nearest tenth, if necessary. [Image])
- 39.7 cars per evening (Find the total number of cars for the week and divide by the number of days. Round to the nearest tenth, if necessary. [Image])
- 37 cars per evening (Find the total number of cars for the week and divide by the number of days. Round to the nearest tenth, if necessary. [Image])
A: 41.1 cars per evening

Q: A small store that specializes in work boots sells 3 different models of boots. The prices of these 3 models are as follows: $10, $70, and $95. An advertisement for this store correctly states that the average cost of the boots sold there is $58.33.
[Image]
Which of the following best explains why this average cost is misleading?
- They should have included a graph in the advertisement. (The $10 boot causes the average to be low enough that it is much less than the two higher priced boots. Therefore the average doesn’t represent the three different prices very well and misleads the customer into thinking that most of the boots will cost less than they actually do.)
- The average needs to be a whole number. (The $10 boot causes the average to be low enough that it is much less than the two higher priced boots. Therefore the average doesn’t represent the three different prices very well and misleads the customer into thinking that most of the boots will cost less than they actually do.)
- The $10 boot brings the average down to an unrealistic value. (The $10 boot causes the average to be low enough that it is much less than the two higher priced boots. Therefore the average doesn’t represent the three different prices very well and misleads the customer into thinking that most of the boots will cost less than they actually do.)
- There are only 3 types of boots. (The $10 boot causes the average to be low enough that it is much less than the two higher priced boots. Therefore the average doesn’t represent the three different prices very well and misleads the customer into thinking that most of the boots will cost less than they actually do.)
A: The $10 boot brings the average down to an unrealistic value.

Q: The manager of a bowling alley organized the scores from the Friday night advanced league in a box-and-whisker plot. Which of the following statements is best supported by the plot?

Bowling Scores (pins)
[Image]
- The mean score for the night was 180 pins. (The five data points on the box-and-whisker plot represent the minimum, median, maximum, and quartile scores. The statement that the highest score for the night was 235 pins is best supported by the plot.)
- A total of 20 bowlers participated in the league. (The five data points on the box-and-whisker plot represent the minimum, median, maximum, and quartile scores. The statement that the highest score for the night was 235 pins is best supported by the plot.)
- The highest score for the night was 235 pins. (The five data points on the box-and-whisker plot represent the minimum, median, maximum, and quartile scores. The statement that the highest score for the night was 235 pins is best supported by the plot.)
- The median score for the night was 160 pins. (The five data points on the box-and-whisker plot represent the minimum, median, maximum, and quartile scores. The statement that the highest score for the night was 235 pins is best supported by the plot.)
A: The highest score for the night was 235 pins.

Q: Mr. Reece teaches physical education to sixth, seventh, and eighth graders at Wilson Middle School. He asked his seventh grade students to write down the number of hours they typically spend playing sports or exercising each weekend. The data was collected and organized in the bar graph shown below. How many students said that they typically exercise between 2 and 3 hours each weekend?

Weekend Exercise
[Image]
- 8 students (The frequency for each bar gives the number of students who belong in that particular category. Locate the bar that represents exercising between 2 and 3 hours each weekend. The frequency for this bar is 9, so 9 students reported that they exercise between 2 and 3 hours each weekend.)
- 3 students (The frequency for each bar gives the number of students who belong in that particular category. Locate the bar that represents exercising between 2 and 3 hours each weekend. The frequency for this bar is 9, so 9 students reported that they exercise between 2 and 3 hours each weekend.)
- 4 students (The frequency for each bar gives the number of students who belong in that particular category. Locate the bar that represents exercising between 2 and 3 hours each weekend. The frequency for this bar is 9, so 9 students reported that they exercise between 2 and 3 hours each weekend.)
- 9 students (The frequency for each bar gives the number of students who belong in that particular category. Locate the bar that represents exercising between 2 and 3 hours each weekend. The frequency for this bar is 9, so 9 students reported that they exercise between 2 and 3 hours each weekend.)
A: 9 students

Q: The line graph shows the cost of a share of stock in a manufacturing company at different times during the afternoon. During which hour did the cost of the stock increase the most?

Stock Price
[Image] [Image]
- between 12:00 and 1:00 (Look for the interval on the graph that shows the greatest increase. The price of the stock increased the most between 3:00 and 4:00.)
- between 3:00 and 4:00 (Look for the interval on the graph that shows the greatest increase. The price of the stock increased the most between 3:00 and 4:00.)
- between 4:00 and 5:00 (Look for the interval on the graph that shows the greatest increase. The price of the stock increased the most between 3:00 and 4:00.)
- between 1:00 and 2:00 (Look for the interval on the graph that shows the greatest increase. The price of the stock increased the most between 3:00 and 4:00.)
A: between 3:00 and 4:00

Q: The stem-and-leaf plot shows how many pairs of sandals were sold at a department store over the past several days. On how many days did the store sell 30 or more pairs of sandals?

Sandal Sales
Stem | Leaves
1 | 6, 7
2 | 3, 5, 7, 8, 8
3 | 0, 1, 2, 5
4 | 4
 | 3 | 2 = 32
- 5 (Count the number of leaves for the stem or stems that represent days where 30 or more pairs of sandals were sold. The correct answer is 5.)
- 12 (Count the number of leaves for the stem or stems that represent days where 30 or more pairs of sandals were sold. The correct answer is 5.)
- 7 (Count the number of leaves for the stem or stems that represent days where 30 or more pairs of sandals were sold. The correct answer is 5.)
- 10 (Count the number of leaves for the stem or stems that represent days where 30 or more pairs of sandals were sold. The correct answer is 5.)
A: 5

Q: Jin has collected several measurements and wants to record them in a double line graph. If she will plot the masses (in grams) along the vertical axis, which of the following scales would be most appropriate for the axis?

Mass (grams)
Trial | Specimen A | Specimen B
1 | 37 g | 32 g
2 | 40 g | 33 g
3 | 30 g | 32 g
4 | 33 g | 34 g
5 | 42 g | 40 g
6 | 39 g | 30 g
- between 10 and 35 grams (The largest mass in the table is 42 grams and the smallest mass is 30 grams. The most appropriate scale for the vertical axis is between 0 and 50 grams.)
- between 0 and 80 grams (The largest mass in the table is 42 grams and the smallest mass is 30 grams. The most appropriate scale for the vertical axis is between 0 and 50 grams.)
- between 0 and 50 grams (The largest mass in the table is 42 grams and the smallest mass is 30 grams. The most appropriate scale for the vertical axis is between 0 and 50 grams.)
- between 40 and 50 grams (The largest mass in the table is 42 grams and the smallest mass is 30 grams. The most appropriate scale for the vertical axis is between 0 and 50 grams.)
A: between 0 and 50 grams

Q: The box and whisker plot shows the number of seventh graders who volunteered each week at a summer camp this year.

Number of Student Volunteers
[Image]

Refer to the information above. What was the median number of seventh grade volunteers each week?
- 28 volunteers (The median is the middle point in the box-and-whisker plot. So the median is 20 student volunteers per week.)
- 20 volunteers (The median is the middle point in the box-and-whisker plot. So the median is 20 student volunteers per week.)
- 15 volunteers (The median is the middle point in the box-and-whisker plot. So the median is 20 student volunteers per week.)
- 22 volunteers (The median is the middle point in the box-and-whisker plot. So the median is 20 student volunteers per week.)
A: 20 volunteers

Q: The box and whisker plot shows the number of seventh graders who volunteered each week at a summer camp this year.

Number of Student Volunteers
[Image]

Refer to the information above. What was the range in the number of student volunteers per week during the summer?
- 19 volunteers (The range of a set of data is the difference between the highest value and the lowest value. So the range of student volunteers per week is [Image].)
- 9 volunteers (The range of a set of data is the difference between the highest value and the lowest value. So the range of student volunteers per week is [Image].)
- 28 volunteers (The range of a set of data is the difference between the highest value and the lowest value. So the range of student volunteers per week is [Image].)
- 20 volunteers (The range of a set of data is the difference between the highest value and the lowest value. So the range of student volunteers per week is [Image].)
A: 19 volunteers

Q: The table below shows the number of miles that a cross country team ran each day last week. What is the mean number of miles? Round your answer to the nearest tenth, if necessary.

Cross Country Training Routine
Day | Miles
Mon | 5
Tues | 6
Wed | 6
Thurs | 5
Fri | 5
Sat | 7
Sun | 6
- 5.1 miles (Divide the total number of miles that the team ran by the number of days shown in the table. [Image])
- 5.7 miles (Divide the total number of miles that the team ran by the number of days shown in the table. [Image])
- 6 miles (Divide the total number of miles that the team ran by the number of days shown in the table. [Image])
- 5 miles (Divide the total number of miles that the team ran by the number of days shown in the table. [Image])
A: 5.7 miles

Q: What is the mode of the temperatures shown in the stem-and-leaf plot?

Temperature (°F)
Stem | Leaves
4 | 1, 6, 7
5 | 0, 0, 0, 2, 3, 7
6 | 0, 3, 9
 | 6 | 3 = 63
- 46°F (The mode of a data set is the number that occurs most often. In this case it is 50°F.)
- 50°F (The mode of a data set is the number that occurs most often. In this case it is 50°F.)
- 28°F (The mode of a data set is the number that occurs most often. In this case it is 50°F.)
- 51°F (The mode of a data set is the number that occurs most often. In this case it is 50°F.)
A: 50°F

Q: Mr. Chang recorded the number of absent students at Brighton Middle School last week. What was the mean number of absent students per day? Round your answer to the nearest tenth, if necessary.

Absent Students
Day | Number of Students
Monday | 8
Tuesday | 8
Wednesday | 7
Thursday | 11
Friday | 7
- 9.9 students per day (Find the total number of absent students for the week and divide by the number of days. [Image])
- 8 students per day (Find the total number of absent students for the week and divide by the number of days. [Image])
- 8.2 students per day (Find the total number of absent students for the week and divide by the number of days. [Image])
- 7.6 students per day (Find the total number of absent students for the week and divide by the number of days. [Image])
A: 8.2 students per day

Q: Mr. Rockwell has prepared several rock samples for an experiment in his third period Physical Science class. The masses of the rocks are 16.5 grams, 15.8 grams, 16.9 grams, 16.1 grams, 15.2 grams, 15.3 grams, 16.7 grams, 15.7 grams, and 15.4 grams. What is the median mass of the rock samples?
- 16 grams (Write the masses of the rocks in order from least to greatest. The median is the middle value, or 15.8 grams.)
- 15.8 grams (Write the masses of the rocks in order from least to greatest. The median is the middle value, or 15.8 grams.)
- 15.5 grams (Write the masses of the rocks in order from least to greatest. The median is the middle value, or 15.8 grams.)
- 16.2 grams (Write the masses of the rocks in order from least to greatest. The median is the middle value, or 15.8 grams.)
A: 15.8 grams

Q: The table below shows the number of minutes Henry spent running on a treadmill each day last week. What was the range in the number of minutes spent running each day?

Henry’s Time
Spent Running
Day | Minutes
Sun | 58
Mon | 49
Tues | 47
Wed | 42
Thurs | 37
Fri | 40
Sat | 47
- 21 minutes (The longest length of time that Henry spent running was 58 minutes, and the shortest length of time was 37 minutes. So the range in the number of minutes spent running each day was [Image] minutes.)
- 58 minutes (The longest length of time that Henry spent running was 58 minutes, and the shortest length of time was 37 minutes. So the range in the number of minutes spent running each day was [Image] minutes.)
- 25 minutes (The longest length of time that Henry spent running was 58 minutes, and the shortest length of time was 37 minutes. So the range in the number of minutes spent running each day was [Image] minutes.)
- 47 minutes (The longest length of time that Henry spent running was 58 minutes, and the shortest length of time was 37 minutes. So the range in the number of minutes spent running each day was [Image] minutes.)
A: 21 minutes

Q: This quarter Sadie has earned grades of 90, 83, 81, 90, 84, and 79 on her math quizzes. Based on these scores, she claims to have an average quiz grade of 90. Explain why this claim might be considered inaccurate.
- The median quiz grade of 90 is higher than most of the other scores. (The mean quiz grade is 84.5, the median is 83.5, and the mode is 90. Choosing the mode grade of 90 as a measure of central tendency might be considered misleading since it is higher than all the other quiz grades. This makes the “average” grade seem higher than it really is.)
- The mean quiz grade of 84.5 is a better measure of central tendency. (The mean quiz grade is 84.5, the median is 83.5, and the mode is 90. Choosing the mode grade of 90 as a measure of central tendency might be considered misleading since it is higher than all the other quiz grades. This makes the “average” grade seem higher than it really is.)
- The mode of the quiz grades is 90 which is higher than all the other scores. (The mean quiz grade is 84.5, the median is 83.5, and the mode is 90. Choosing the mode grade of 90 as a measure of central tendency might be considered misleading since it is higher than all the other quiz grades. This makes the “average” grade seem higher than it really is.)
- The median quiz grade of 83.5 is too low when compared with the other scores. (The mean quiz grade is 84.5, the median is 83.5, and the mode is 90. Choosing the mode grade of 90 as a measure of central tendency might be considered misleading since it is higher than all the other quiz grades. This makes the “average” grade seem higher than it really is.)
A: The mode of the quiz grades is 90 which is higher than all the other scores.

Q: The horizontal bar graph shows the results of a survey conducted by a research company to determine support for a local issue. The research company interviewed a random sample of 207 voters and asked whether each voter supports or opposes the issue.

Support for Issue 5
[Image]

Which of the following statements is most misleading about the bar graph shown above?
- The horizontal axis showing the number of voters does not begin at 0. (The horizontal axis showing the number of voters begins at 60 instead of 0. This makes the bar for the number of voters in support of Issue 5 appear to be much larger than the bar for those who oppose the issue.)
- The labels on the vertical axis are not accurate. (The horizontal axis showing the number of voters begins at 60 instead of 0. This makes the bar for the number of voters in support of Issue 5 appear to be much larger than the bar for those who oppose the issue.)
- The word Support in the title of the graph is misleading. (The horizontal axis showing the number of voters begins at 60 instead of 0. This makes the bar for the number of voters in support of Issue 5 appear to be much larger than the bar for those who oppose the issue.)
- The scale of the vertical axis is not shown. (The horizontal axis showing the number of voters begins at 60 instead of 0. This makes the bar for the number of voters in support of Issue 5 appear to be much larger than the bar for those who oppose the issue.)
A: The horizontal axis showing the number of voters does not begin at 0.

Q: The horizontal bar graph shows the results of a survey conducted by a research company to determine support for a local issue. The research company interviewed a random sample of 207 voters and asked whether each voter supports or opposes the issue.

Support for Issue 5
[Image]

What invalid conclusion might you draw from the above bar graph the way it is drawn?
- About twice as many voters support Issue 5 than oppose it. (The way the graph is drawn, the bar for the supporters of Issue 5 appears to be about twice the size of the bar for the opponents. This might lead you to draw the false conclusion that about twice as many voters support Issue 5 than oppose it.)
- About twice as many voters oppose Issue 5 than support it. (The way the graph is drawn, the bar for the supporters of Issue 5 appears to be about twice the size of the bar for the opponents. This might lead you to draw the false conclusion that about twice as many voters support Issue 5 than oppose it.)
- Among those surveyed, about 29 more voters support Issue 5 than oppose it. (The way the graph is drawn, the bar for the supporters of Issue 5 appears to be about twice the size of the bar for the opponents. This might lead you to draw the false conclusion that about twice as many voters support Issue 5 than oppose it.)
- More voters need to be surveyed to reach a valid conclusion. (The way the graph is drawn, the bar for the supporters of Issue 5 appears to be about twice the size of the bar for the opponents. This might lead you to draw the false conclusion that about twice as many voters support Issue 5 than oppose it.)
A: About twice as many voters support Issue 5 than oppose it.

Q: The box-and-whisker plot shows the daily high temperatures during a 10-day stretch in April. During this period, the mean temperature was 68°F, and the mode was 58°F. Which of the following statements is not true regarding the data?

High Temperatures (°F)
[Image]
- The median temperature of 62°F is a good measure of central tendency since it is close to most of the data points. (There are a few high temperatures that skew the data in the plot to the right. Since the mean temperature of 68°F is greater than more than 75% of the data, it is not a very good measure of central tendency.)
- The mode of 58°F is not a good measure of central tendency since it is lower than the majority of the temperatures. (There are a few high temperatures that skew the data in the plot to the right. Since the mean temperature of 68°F is greater than more than 75% of the data, it is not a very good measure of central tendency.)
- The mean temperature of 68°F is a good measure of central tendency since it is close to most of the data points. (There are a few high temperatures that skew the data in the plot to the right. Since the mean temperature of 68°F is greater than more than 75% of the data, it is not a very good measure of central tendency.)
- The range in temperatures is 22°F. This represents a fairly large difference in high temperatures over a 10-day period. (There are a few high temperatures that skew the data in the plot to the right. Since the mean temperature of 68°F is greater than more than 75% of the data, it is not a very good measure of central tendency.)
A: The mean temperature of 68°F is a good measure of central tendency since it is close to most of the data points.

Q: Wildlife officials have been tracking the number of deer living in a region over the past several years. The scatterplot shows the data that they have collected.

Deer Population Study
[Image]

What type of relationship is there in the above scatterplot of the deer population?
- There is no relationship. (The data are fairly linear with a negative slope. There is a negative relationship.)
- There is a neutral relationship. (The data are fairly linear with a negative slope. There is a negative relationship.)
- There is a positive relationship. (The data are fairly linear with a negative slope. There is a negative relationship.)
- There is a negative relationship. (The data are fairly linear with a negative slope. There is a negative relationship.)
A: There is a negative relationship.

Q: Wildlife officials have been tracking the number of deer living in a region over the past several years. The scatterplot shows the data that they have collected.

Deer Population Study
[Image]

What conclusion can you draw from the deer population scatterplot shown above?
- As time increases, the deer population decreases. (As time increases, the deer population decreases.)
- Since there is no relationship in the data, no conclusion can be drawn. (As time increases, the deer population decreases.)
- As the temperature increases, the deer population also increases. (As time increases, the deer population decreases.)
- As time increases, the deer population also increases. (As time increases, the deer population decreases.)
A: As time increases, the deer population decreases.

Q: The scatterplot shows how many cups of hot chocolate have been sold at a ski resort based on the outside temperature. Use the line of best fit to predict the number of sales if the temperature is 10°F.

Hot Chocolate Sales
[Image] [Image]
- 73 cups (Follow the line of best fit to the left to the point where [Image]. The y-value at this point is about 63, so the ski resort would sell about 63 cups of hot chocolate at this temperature.)
- 53 cups (Follow the line of best fit to the left to the point where [Image]. The y-value at this point is about 63, so the ski resort would sell about 63 cups of hot chocolate at this temperature.)
- 63 cups (Follow the line of best fit to the left to the point where [Image]. The y-value at this point is about 63, so the ski resort would sell about 63 cups of hot chocolate at this temperature.)
- 71 cups (Follow the line of best fit to the left to the point where [Image]. The y-value at this point is about 63, so the ski resort would sell about 63 cups of hot chocolate at this temperature.)
A: 63 cups

Q: The ages of the people at a movie theater on a Thursday afternoon are shown in the box-and-whisker plot below. Which of the following statements is a correct interpretation of the plot?

Ages of Movie Goers
[Image]
- The mean age of the movie goers is 27 years. (The data points represent the minimum, maximum, and median ages of the movie goers as well as the quartile value ages. So the statement that the oldest person at the theater is 60 years old is the only correct interpretation of the plot.)
- The youngest person at the theater is 10 years old. (The data points represent the minimum, maximum, and median ages of the movie goers as well as the quartile value ages. So the statement that the oldest person at the theater is 60 years old is the only correct interpretation of the plot.)
- The median age of the movie goers is 17 years. (The data points represent the minimum, maximum, and median ages of the movie goers as well as the quartile value ages. So the statement that the oldest person at the theater is 60 years old is the only correct interpretation of the plot.)
- The oldest person at the theater is 60 years old. (The data points represent the minimum, maximum, and median ages of the movie goers as well as the quartile value ages. So the statement that the oldest person at the theater is 60 years old is the only correct interpretation of the plot.)
A: The oldest person at the theater is 60 years old.

Q: Mr. Peterson asked the students in 5th period Algebra to write down the number of hours they typically spend doing homework each weekend. The class then collected the data and recorded it in the bar graph shown below. How many students said that they typically do between 3 and 4 hours of homework each weekend?

Weekend Study Time
[Image]
- 9 (Locate the bar that represents doing between 3 and 4 hours of homework each weekend. The frequency is the number of students who belong in this category. In this case it is 5.)
- 5 (Locate the bar that represents doing between 3 and 4 hours of homework each weekend. The frequency is the number of students who belong in this category. In this case it is 5.)
- 8 (Locate the bar that represents doing between 3 and 4 hours of homework each weekend. The frequency is the number of students who belong in this category. In this case it is 5.)
- 3 (Locate the bar that represents doing between 3 and 4 hours of homework each weekend. The frequency is the number of students who belong in this category. In this case it is 5.)
A: 5

Q: Vito looked up census data to study the population in his town over the past several decades and recorded the data in the table. Which of the following line graphs correctly displays the data shown in the table?

Pleasant Springs
Population
Year | Population (thousands)
1970 | 4.6
1980 | 5.4
1990 | 6.3
2000 | 7.1
- [Image] (Plot each data point on a coordinate grid. Label the axes and connect the points with line segments. The correct graph is shown below. [Image])
- [Image] (Plot each data point on a coordinate grid. Label the axes and connect the points with line segments. The correct graph is shown below. [Image])
- [Image] (Plot each data point on a coordinate grid. Label the axes and connect the points with line segments. The correct graph is shown below. [Image])
- [Image] (Plot each data point on a coordinate grid. Label the axes and connect the points with line segments. The correct graph is shown below. [Image])
A: [Image]

Q: The stem-and-leaf plot shows the grades earned on Mr. Chen’s final exam in Social Studies. How many students earned a score in the seventies?

Final Exam Grades
Stem | Leaves
6 | 6, 7, 7, 9
7 | 0, 2, 6, 8, 8
8 | 0, 0, 3, 5, 6, 6, 9
9 | 2, 2, 5
 | 9 | 5 = 95
- 4 (Count the number of leaves for the stem or stems that represent scores in the seventies. There are 5 leaves, so a total of 5 students earned a score in the seventies.)
- 5 (Count the number of leaves for the stem or stems that represent scores in the seventies. There are 5 leaves, so a total of 5 students earned a score in the seventies.)
- 19 (Count the number of leaves for the stem or stems that represent scores in the seventies. There are 5 leaves, so a total of 5 students earned a score in the seventies.)
- 6 (Count the number of leaves for the stem or stems that represent scores in the seventies. There are 5 leaves, so a total of 5 students earned a score in the seventies.)
A: 5

Q: For every $100.00 that My-Lien spends on her monthly expenses, $42.00 goes toward the rent, $24.00 goes toward car expenses, $14.00 is spent on utilities, and $20.00 goes toward food. Which of the following displays best shows the proportion of My-Lien’s monthly expenses to her total budget?
- My-Lien’s Monthly Expenses [Image] (Of My-Lien’s monthly expenses, rent takes up 42%, 24% goes toward car expenses, 14% is spent on utilities, and 20% goes toward food costs. The circle graph that best shows these proportions is shown below. My-Lien’s Monthly Expenses [Image])
- My-Lien’s Monthly Expenses [Image] (Of My-Lien’s monthly expenses, rent takes up 42%, 24% goes toward car expenses, 14% is spent on utilities, and 20% goes toward food costs. The circle graph that best shows these proportions is shown below. My-Lien’s Monthly Expenses [Image])
- My-Lien’s Monthly Expenses [Image] (Of My-Lien’s monthly expenses, rent takes up 42%, 24% goes toward car expenses, 14% is spent on utilities, and 20% goes toward food costs. The circle graph that best shows these proportions is shown below. My-Lien’s Monthly Expenses [Image])
- My-Lien’s Monthly Expenses [Image] (Of My-Lien’s monthly expenses, rent takes up 42%, 24% goes toward car expenses, 14% is spent on utilities, and 20% goes toward food costs. The circle graph that best shows these proportions is shown below. My-Lien’s Monthly Expenses [Image])
A: My-Lien’s Monthly Expenses [Image]

Q: The box-and-whisker plot shows the boiling points, in degrees Celsius, of several liquids. What is the median boiling point in the graph?

Boiling Point (°C)
[Image]
- 84°C (The median is the middle point in the box-and-whisker plot, or 84°C.)
- 49°C (The median is the middle point in the box-and-whisker plot, or 84°C.)
- 66°C (The median is the middle point in the box-and-whisker plot, or 84°C.)
- 24°C (The median is the middle point in the box-and-whisker plot, or 84°C.)
A: 84°C

Q: The table shows the number of student volunteers at a neighborhood recreation center over the past 8 weeks. What is the mean number of volunteers during this period? Round your answer to the nearest tenth if necessary.

Week | Volunteers
1 | 6
2 | 15
3 | 10
4 | 15
5 | 14
6 | 8
7 | 14
8 | 9
- 10.1 (Find the total number of volunteers and divide by the number of weeks. [Image])
- 11.4 (Find the total number of volunteers and divide by the number of weeks. [Image])
- 13 (Find the total number of volunteers and divide by the number of weeks. [Image])
- 12 (Find the total number of volunteers and divide by the number of weeks. [Image])
A: 11.4

Q: The number of turnovers committed by the Lancers basketball team is shown in the table for the first 9 games of the season. Which of the following measures would make the rate of turnovers per game appear as small as possible?

Game | Turnovers
1 | 7
2 | 14
3 | 21
4 | 10
5 | 14
6 | 13
7 | 5
8 | 15
9 | 8
- median (The mean is 11.9, the median is 13, the mode is 14, and the range is 16. Since the mean has the smallest value, it would make the rate of turnovers per game appear as small as possible.)
- range (The mean is 11.9, the median is 13, the mode is 14, and the range is 16. Since the mean has the smallest value, it would make the rate of turnovers per game appear as small as possible.)
- mode (The mean is 11.9, the median is 13, the mode is 14, and the range is 16. Since the mean has the smallest value, it would make the rate of turnovers per game appear as small as possible.)
- mean (The mean is 11.9, the median is 13, the mode is 14, and the range is 16. Since the mean has the smallest value, it would make the rate of turnovers per game appear as small as possible.)
A: mean

Q: What is the range of the test scores shown in the stem-and-leaf plot?

Test Scores
Stem | Leaves
6 | 1, 4, 6, 9
7 | 1, 4, 5, 6, 7
8 | 4, 4, 6, 6, 7, 8, 9
9 | 1, 1, 2, 7
 | 9 | 1 = 91
- 61 (The highest score in the plot is 97, and the lowest score is 61. So the range of the test scores is [Image].)
- 31 (The highest score in the plot is 97, and the lowest score is 61. So the range of the test scores is [Image].)
- 97 (The highest score in the plot is 97, and the lowest score is 61. So the range of the test scores is [Image].)
- 36 (The highest score in the plot is 97, and the lowest score is 61. So the range of the test scores is [Image].)
A: 36

Q: Peter works as a salesperson at an electronics retailer. The table shows the number of computers that he sold each month over the past several months. What is the mean number of computers sold each month during this period of time? Round your answer to the nearest tenth if necessary.

Peter’s Sales
Month | Number of Computers
February | 6
March | 6
April | 9
May | 10
June | 10
July | 12
August | 4
- 9 (Divide the total number of computers sold by the number of months. [Image])
- 8.1 (Divide the total number of computers sold by the number of months. [Image])
- 7.6 (Divide the total number of computers sold by the number of months. [Image])
- 7.1 (Divide the total number of computers sold by the number of months. [Image])
A: 8.1

Q: What is the range of the masses shown in the box-and-whisker plot?

Mass (grams)
[Image]
- 43 g (The range is the difference between the largest mass and the smallest mass, or [Image].)
- 67 g (The range is the difference between the largest mass and the smallest mass, or [Image].)
- 23 g (The range is the difference between the largest mass and the smallest mass, or [Image].)
- 33 g (The range is the difference between the largest mass and the smallest mass, or [Image].)
A: 43 g

Q: What is the mode of the ages shown in the stem-and-leaf plot?

Ages
Stem | Leaves
1 | 5, 6, 8, 9
2 | 1, 5, 5, 5, 9, 9
3 | 0, 3, 5, 5, 8, 8
 | 1 | 9 = 19
- 15 (The mode is the data point that occurs most frequently in a data set. In this case it is 25.)
- 25 (The mode is the data point that occurs most frequently in a data set. In this case it is 25.)
- 38 (The mode is the data point that occurs most frequently in a data set. In this case it is 25.)
- 23 (The mode is the data point that occurs most frequently in a data set. In this case it is 25.)
A: 25

Q: Executives from the Dee-Light music store surveyed 147 8th graders and asked them to identify their favorite music store. The bar graph below shows the number of students who chose Dee-Light and the number of students who chose their competitor, King Music.

Favorite Music Store
[Image] [Image]

Refer to the Favorite Music Store graph above. What is misleading about the graph?
- The labels on the horizontal and vertical axes are not accurate. (The vertical axis does not begin at 0 which distorts the bars in the graph. It makes the bar for Dee-Light appear to be much larger than the bar for King Music.)
- The vertical axis does not begin at 0 which distorts the bars in the graph. (The vertical axis does not begin at 0 which distorts the bars in the graph. It makes the bar for Dee-Light appear to be much larger than the bar for King Music.)
- The survey displays the results for only two different music stores. (The vertical axis does not begin at 0 which distorts the bars in the graph. It makes the bar for Dee-Light appear to be much larger than the bar for King Music.)
- The scale of the horizontal axis is not shown. (The vertical axis does not begin at 0 which distorts the bars in the graph. It makes the bar for Dee-Light appear to be much larger than the bar for King Music.)
A: The vertical axis does not begin at 0 which distorts the bars in the graph.

Q: Executives from the Dee-Light music store surveyed 147 8th graders and asked them to identify their favorite music store. The bar graph below shows the number of students who chose Dee-Light and the number of students who chose their competitor, King Music.

Favorite Music Store
[Image] [Image]

Refer to the Favorite Music Store graph above. What invalid conclusion might be drawn from the bar graph as it is drawn?
- About 4 times as many students prefer Dee-Light to King Music. (The way the graph is drawn, the bar for Dee-Light appears to be about twice as big as the bar for King Music. So an invalid conclusion that might be drawn from the graph is that about twice as many students preferred Dee-Light over King Music.)
- About twice as many students preferred Dee-Light to King Music. (The way the graph is drawn, the bar for Dee-Light appears to be about twice as big as the bar for King Music. So an invalid conclusion that might be drawn from the graph is that about twice as many students preferred Dee-Light over King Music.)
- More students need to be surveyed. (The way the graph is drawn, the bar for Dee-Light appears to be about twice as big as the bar for King Music. So an invalid conclusion that might be drawn from the graph is that about twice as many students preferred Dee-Light over King Music.)
- About 19 more students prefer Dee-Light to King Music. (The way the graph is drawn, the bar for Dee-Light appears to be about twice as big as the bar for King Music. So an invalid conclusion that might be drawn from the graph is that about twice as many students preferred Dee-Light over King Music.)
A: About twice as many students preferred Dee-Light to King Music.

Q: A cable company took a random sample of its subscribers to get their opinion on a new television series. Based on the results of this survey, they made the following claim:

Eighty-five percent of all television viewers agree, this new series is a hit!

Explain why this claim is misleading.
- This percentage of viewers is not enough to make the series a hit. (The company only surveyed its viewers but made the claim about all viewers. They do not have enough information to make a claim about all television viewers.)
- The company only surveyed viewers in one region of the country. (The company only surveyed its viewers but made the claim about all viewers. They do not have enough information to make a claim about all television viewers.)
- The company did not survey enough of their viewers. (The company only surveyed its viewers but made the claim about all viewers. They do not have enough information to make a claim about all television viewers.)
- The company only surveyed its viewers but made the claim about all viewers. (The company only surveyed its viewers but made the claim about all viewers. They do not have enough information to make a claim about all television viewers.)
A: The company only surveyed its viewers but made the claim about all viewers.

Q: Carlos randomly interviewed 60 8th graders at the Westwood Mall Saturday afternoon to determine their reason for going to the mall. Based on the results of his survey, he made the following claim:

Two out of three middle school students visit the mall to go shopping.

Explain why this claim is misleading.
- Carlos only interviewed students in the food court. (Since Carlos only surveyed 8th graders, his sample is not representative of all middle school students. It is invalid to draw a conclusion on the whole population of middle school students.)
- Carlos did not survey enough 8th graders to draw a valid conclusion. (Since Carlos only surveyed 8th graders, his sample is not representative of all middle school students. It is invalid to draw a conclusion on the whole population of middle school students.)
- Since Carlos surveyed only 8th graders, his sample is not representative of all middle school students. (Since Carlos only surveyed 8th graders, his sample is not representative of all middle school students. It is invalid to draw a conclusion on the whole population of middle school students.)
- Carlos did not use a random sample of 8th graders. (Since Carlos only surveyed 8th graders, his sample is not representative of all middle school students. It is invalid to draw a conclusion on the whole population of middle school students.)
A: Since Carlos surveyed only 8th graders, his sample is not representative of all middle school students.

Q: Students in grades seven and eight at a local school were asked about the amount of homework they had each night. Their results are summarized in the bar graph below. The blue bars represent seventh grade, and the red bars represent eighth grade.

Amount of Homework Done by
Students in Seventh and Eighth Grades
[Image]
Less than 30 min | 30 min to 1 hr | 1 hr - 2 hr | 2 hr - 3 hr | More than 3 hr

Based on the bar graph above, what is the difference between the number of seventh-grade students and the number of eighth-grade students who had more than three hours of homework?
- 3 (Look at the bars for the category “more than three hours.” Find the difference between the bars. (Subtract the values of the two bars.))
- 9 (Look at the bars for the category “more than three hours.” Find the difference between the bars. (Subtract the values of the two bars.))
- 7 (Look at the bars for the category “more than three hours.” Find the difference between the bars. (Subtract the values of the two bars.))
- 0 (Look at the bars for the category “more than three hours.” Find the difference between the bars. (Subtract the values of the two bars.))
A: 9

Q: Students in grades seven and eight at a local school were asked about the amount of homework they had each night. Their results are summarized in the bar graph below. The blue bars represent seventh grade, and the red bars represent eighth grade.

Amount of Homework Done by
Students in Seventh and Eighth Grades
[Image]
Less than 30 min | 30 min to 1 hr | 1 hr - 2 hr | 2 hr - 3 hr | More than 3 hr

Based on the bar graph above, how many students in 8th grade responded to the survey?
- 14 (Look at all the bars for 8th grade. Add up the total number of students represented.)
- 212 (Look at all the bars for 8th grade. Add up the total number of students represented.)
- 99 (Look at all the bars for 8th grade. Add up the total number of students represented.)
- 113 (Look at all the bars for 8th grade. Add up the total number of students represented.)
A: 113

Q: The students in social studies class are studying immigration and learned that many immigrants changed their last name when they became naturalized United States citizens. The lengths of ten students’ last names are shown in the table below.

Number of Letters in Students’ Last Names
9, 11, 7, 7, 5, 5, 11, 12, 12, 12

Refer to the data above. What is the approximate mean number of letters in the sampled last names? Round your answer to the nearest whole number,
- 12 (To find the mean, add up all the lengths and divide by 10.)
- 9 (To find the mean, add up all the lengths and divide by 10.)
- 7 (To find the mean, add up all the lengths and divide by 10.)
- 10 (To find the mean, add up all the lengths and divide by 10.)
A: 9

Q: The students in social studies class are studying immigration and learned that many immigrants changed their last name when they became naturalized United States citizens. The lengths of ten students’ last names are shown in the table below.

Number of Letters in Students’ Last Names
9, 11, 7, 7, 5, 5, 11, 12, 12, 12

Refer to the data above. What is the median number of letters in the sampled last names?
- 9.1 (To find the median, put the numbers in order and find the number in the middle of the list.)
- 12 (To find the median, put the numbers in order and find the number in the middle of the list.)
- 10 (To find the median, put the numbers in order and find the number in the middle of the list.)
- 7 (To find the median, put the numbers in order and find the number in the middle of the list.)
A: 10

Q: The students in social studies class are studying immigration and learned that many immigrants changed their last name when they became naturalized United States citizens. The lengths of ten students’ last names are shown in the table below.

Number of Letters in Students’ Last Names
9, 11, 7, 7, 5, 5, 11, 12, 12, 12

Refer to the data above. What is the range of the number of letters in the sampled last names?
- 12 (To find the range, subtract the smallest number from the largest.)
- 9.1 (To find the range, subtract the smallest number from the largest.)
- 10 (To find the range, subtract the smallest number from the largest.)
- 7 (To find the range, subtract the smallest number from the largest.)
A: 7

Q: Natalie is shopping for a new dishwasher and has organized the prices of several different models in a box-and-whisker plot. What is the price of the least expensive model in the list?

Dishwasher Prices (dollars)
[Image]
- $150 (The least expensive dishwasher model in the list is $140.)
- $200 (The least expensive dishwasher model in the list is $140.)
- $140 (The least expensive dishwasher model in the list is $140.)
- $290 (The least expensive dishwasher model in the list is $140.)
A: $140

Q: The scatterplot below shows the number of absent students each week in the Lakeside School District. What type of relationship is shown by the data?

[Image] [Image]
- There is a positive relationship. (The data are not linear. There is no relationship.)
- There is a neutral relationship. (The data are not linear. There is no relationship.)
- There is a negative relationship. (The data are not linear. There is no relationship.)
- There is no relationship. (The data are not linear. There is no relationship.)
A: There is no relationship.

Q: The scatterplot below shows the number of computers sold at an electronics store during their first seven months. What conclusion can you draw from the scatterplot?

[Image] [Image]
- As time increases, the number of computer sales has decreased. (As time increases, the number of computer sales has decreased.)
- Since there is no relationship in the data, no conclusion can be drawn. (As time increases, the number of computer sales has decreased.)
- As time increases, the number of computer sales has also increased. (As time increases, the number of computer sales has decreased.)
- As the computer prices decrease, the number of sales increases. (As time increases, the number of computer sales has decreased.)
A: As time increases, the number of computer sales has decreased.

Q: The scatterplot below shows the water temperature of a lake at different depths. Use the line of best fit to predict the temperature of the water at a depth of 60 feet.

[Image] [Image]
- 74°F (Follow the line of best fit to the right to the point where [Image]. The y-value at this point is about 49. So the temperature of the water would be about 49°F at a depth of 60 feet.)
- 49°F (Follow the line of best fit to the right to the point where [Image]. The y-value at this point is about 49. So the temperature of the water would be about 49°F at a depth of 60 feet.)
- 58°F (Follow the line of best fit to the right to the point where [Image]. The y-value at this point is about 49. So the temperature of the water would be about 49°F at a depth of 60 feet.)
- 39°F (Follow the line of best fit to the right to the point where [Image]. The y-value at this point is about 49. So the temperature of the water would be about 49°F at a depth of 60 feet.)
A: 49°F