Question

In a test of the effectiveness of garlic for lowering​ cholesterol, 42 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 3.2 and a standard deviation of 15.9. Construct a 90​% 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?

What is the confidence interval estimate of the population mean mu​? _ ​mg/dL<mu< _ ​mg/dL ​(Round to two decimal places as​ needed.)

What does the confidence interval suggest about the effectiveness of the​ treatment?

A. The confidence interval limits contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels.

B. The confidence interval limits contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.

C. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels.

D. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.

Answer 1

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