In a test of the effectiveness of garlic for lowering cholesterol, 43 subjects w

Question

In a test of the effectiveness of garlic for lowering cholesterol, 43 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 4.7 and a standard deviation of 15.6 Complete parts (a) and (b) below.

a. what is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment?

b. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDLcholesterol?

Explanation / Answer

solution=

A. What is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment?
The best point estimate is 4.7 mg/dL

b. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDLcholesterol?

sample mean = x-bar = 4.7
ME = 1.96*15.6/sqrt(43) = 4.663

95% CI: 4.7 - 4.663 < u < 4.7 + 4.663

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