Executive workout dropouts. Refer to the Journal of Sport Behavior (2001) study of variety in exercise workouts, presented in Exercise 5.58 (p. 283). One group of 40 people varied their exercise routine in workouts, while a second group of 40 exercisers had no set schedule or regulations for their workouts. By the end of the study, 15 people had dropped out of the first exercise group and 23 had dropped out of the second group.
a. Find the dropout rates (i.e., the percentage of exercisers who had dropped out of the exercise group) for each of the two groups of exercisers.
b. Find a 90% confidence interval for the difference between the dropout rates of the two groups of exercisers.
c. Give a practical interpretation of the confidence interval you found in part c.
Exercise 5.58
Exercise workout dropouts. Researchers at the University of Florida’s Department of Exercise and Sport Sciences conducted a study of variety in exercise workouts. (Journal of Sport Behavior, 2001.) A sample of 120 men and women were randomly divided into three 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 result.
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 result.
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