In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects w

Question

In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes before-after in their levels of LDL cholesterol in mg dL have a mean of 3.6 and a standard deviation of 179. Construct a 99% 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 LDL cholesterol? Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. What is the confidence interval estimate of the population mean ? (Round to two decimal places as needed.)

Explanation / Answer

One-Sample T

N Mean StDev SE Mean 99% CI
45 3.60 17.90 2.67 (-3.58, 10.78)

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