Statistics

Statistics

Appendix A (Homework Sets) Solutions A.1 Homework Set Solutions

1. See below. a. 1 b. 1.47

c. −0.47 d. 0 e. −1 2. The grade of 43 has a better relative position. 3. See below. a. The percentile rank for …

i. 5 is 8. A student whose score was 5 did better than 8% of the class. ii. 12 is 25. A student whose score was 12 did better than 25% of the class. iii. 15 is 42. A student whose score was 15 did better than 42% of the class. iv. 16 is 58. A student whose score was 16 did better than 58% of the class. v. 20 is 75. A student whose score was 20 did better than 75% of the class. vi. 21 is 92. A student whose score was 21 did better than 92% of the class. b. 12 corresponds to the 33 rd percentile 4. See below.

Age vs. Time Spent Excercising

13

10

8

5

Hours per Week

3

0

0

15

30

45

60

75

Age

a.

b. This is negative correlation.

5. Answers will vary. 6. 6

7. 75 8. 15 9. −10 10. − 6

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