A health spa claims that a new exercise program will
Chapter , Problem 5.61(choose chapter or problem)
A health spa claims that a new exercise program will reduce a persons waist size by 2 centimeters on average over a 5-day period. The waist sizes, in centimeters, of 6 men who participated in this exercise program are recorded before and after the 5-day period in the following table: Man Waist Size Before Waist Size After 1 2 3 4 5 6 90.4 95.5 98.7 115.9 104.0 85.6 91.7 93.9 97.4 112.8 101.3 84.0 By computing a 95% confidence interval for the mean reduction in waist size, determine whether the health spas claim is valid. Assume the distribution of differences in waist sizes before and after the program to be approximately normal.
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