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Statistics Help

**Question: **Researchers at the University of Florida's Department of Exercise and Sport Sciences conducted a study of variety i exercise workouts. A sample of120 men and women were randomly divided into 3 groups, with 40 people per group. Group 1 members varied their exercise routine in workouts, group 2 members performed the same exercise at each workout and group 3 members had no set schedule or regulations for their workouts.

a. by the end of the study, 15 people had dropped out of the first exercise group. estimate the dropout rate for exercisers who vary their routine in workouts. Use a 90% confidence interval and interpret the results.

b. by the end of the study, 23 people had dropped out of the third exercise group. estimate the dropout rate for

exercisers who have no set schedule for their workouts. Use a 90% confidence

interval and interpret the results. Edit

**Answer: **a. proportion p=15/40=0.375

Margin of error,e=sqrt(pq/N)*z_c

= sqrt(0.375*0.625/40)*1.65 [z at 90% confidence.]

=0.126

Confidence interval(p-e, p+e)=(0.375-0.126, 0.375+0.126)=(0.249, 0.501)(Ans.) Edit

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