Fifteen adult males between the age of 35 and 50 participated in a study to eval

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Fifteen adult males between the age of 35 and 50 participated in a study to evaluate the effect of diet and exercise on blood cholesterol levels. The total cholesterol was measured in each object initially, and then 3 months after participating in an aerobics exercise program and switching to a low-fat diet, as shown in the following table. Do the data support the claim that low-fat diet and aerobic exercise are of value in producing a mean reduction in blood cholesterol levels ? Use the P-value approach. Find a 95% CI on the mean reduction in blood cholesterol level. A computer scientist is investigating the usefulness of two different design languages in improving programming tasks. Twelve expert programmers, familiar with both languages, are asked to code a standard function in both languages, and the time in minutes is recorded. The data are shown here:

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