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13) A study of men aged 20

20 to 40

40 investigated the relationship between the

average number of hours of exercise per week x

x and average number of hours of sleep per day y

y. The regression line was found to be y=8.5−0.2x

y=8.5-0.2x. Which of the following is a true statement?

a) For every additional hour of weekly exercise there is a corresponding 0.2

0.2 decrease in daily hours of sleep

b) We can correctly predict that a 60

60 year-old man who exercises 6

6 hours per week sleeps on average 7.3

7.3 hours per day

c) For every additional hour of weekly exercise there is a corresponding 8.5

8.5 increase in daily hours of sleep.

d) Increasing amount of weekly exercise causes a decrease in daily hours of sleep.

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