NAME ______________________________________________ DATE______________________________ PERIOD ______________

Unit 5 Review SCORE __________

For Exercises 1 and 2, use the scatterplot shown at the right.

1. Describe the association, if any, among the observed data.

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2. Draw a trend line and use it to make a prediction about the daily amount of physical activity for a person who is 50 years old._______________________

The table shows the total number of problems solved each hour by seventh and eighth grade students.

3. Construct two scatterplots of the data in the table.

4. Contrast the two scatterplots. Which scatterplot suggests a linear relationship? a nonlinear relationship?____________________________________________________________________________________

For Exercises 6 and 7, use the scatterplot that shows the length of a metal spring when weights are attached.

6. Write an equation in slope-intercept form for the trend line. _______________________________________________________

7. Make a prediction about the length of a spring when 20 weights are attached. _______________________________________________

Course 3 • Chapter 9 Scatterplots and Data Analysis 99

HourSeventhGraders

EighthGraders

1 1 32 4 6

3 9 104 16 12

5 25 166 16 18

7 9 208 4 24

Springs and WeightsNumber of Weights

1 2 3 4 5 6

Spring (in) 10 13 14 15 18 19

NAME ______________________________________________ DATE______________________________ PERIOD ______________

Review SCORE __________

8. Determine the mean absolute deviation for the set of data in the table. Round to the nearest hundredth if necessary. Then describe what the mean absolute deviation represents.

_________________________________________________

_________________________________________________

For Exercises 9 and 10, use the data set 2, 3, 3, 4, 5, 8, 8, 10, 10, 12.

9. What is the mean of the data? ______________________________________

10. Determine the mean absolute deviation of the data set. ___________________________

11. The table given at the right shows the number of students who attended the Spanish Club meetings during the school year. To the nearest tenth, what is the mean absolute deviation of the data? ___________________

12. Every fifth person walking into a Friday night football game was asked to name his or her favorite school. Is this a valid way to survey Katy, Texas and find out which school is the most popular? Explain why or why not.______________________________________________________________________________________________

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13. A radio station is conducting a survey to determine the genre of music most popular among teenagers. The manager of the station randomly surveys teenagers in the local school system. Is the sample method valid? If so, suppose the station surveys 200 more teenagers. How many teenagers will prefer Jazz?

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15. The table below shows the distance covered each hour by an industrial train making deliveries. Construct a scatterplot of the data and analyze the association among the observed data.

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100 Course 3 • Chapter 9 Scatterplots and Data Analysis

Pumpkin WeightsPumpkin A B C D EWeight (lb)

88 50 75 83 94

Spanish ClubAttendance

14 21 1726 13 13

Genre ofMusic

Number ofTeenagers

Jazz 12Pop 13

Rock 15

Distance (mi) 20 45 73 103 134 154 198 205 219Time (h) 1 2 3 4 5 6 7 8 9