Dr Zhan has good reason to believe that young adults exercis

Dr. Zhan has good reason to believe that young adults exercise more than older adults. From a nationwide health survey, she knows that older adults exercise 4 times a week (? = 4) with ?_x = 2  Below are the number of times per week of exercise obtained from a sample of 10 young adults.

4     7     3      2      2      3      5      5      4      6

1)

Based on the description of Dr. Zhan

Solution

(1) ? =4

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(2)?_x = 2

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(3) xbar = (4+7+...+4+6)/10 =2.766667