Twenty adult males between the ages of 30 and 40 participated in a study to evaluate the eect of a specic health regimen involving diet and exercise on the blood cholesterol. Ten were randomly selected to be a control group, and ten others were assigned to take part in the regimen as the treatment group for a period of 6 months. The following data show the reduction in cholesterol experienced for the time period for the 20 subjects: Control group: 7 3 4 14 2 5 227 9 5Treatment group: 6 5 9 4 4 12 37 5 3 3 (a) Do a dot plot of the data for both groups on the same graph. (b) Compute the mean, median, and 10% trimmed mean for both groups. (c) Explain why the dierence in means suggests one conclusion about the eect of the regimen, while the dierence in medians or trimmed means suggests a dierent conclusion.
Twenty adult males between the ages of 30 and 40
Problem 1.5 Chapter 1
Probability and Statistics for Engineers and the Scientists | 9th Edition
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