In a test of the effectiveness of garlic for lowering cholesterol. 48 subjects w

Question

In a test of the effectiveness of garlic for lowering cholesterol. 48 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 2.8 and a standard deviation of 15.7. Complete parts (a) and (b) below. a. What is the best point estimate of the population mean not change in LDL cholesterol after the garlic treatment. What does the confidence interval What is the confidence interval estimate of the population mean mu? (Round to two decimal places as needed.) What does the confidence interval suggest about the effectiveness of the treatment? A. The confidence interval limits do not contain 0, suggesting that the garlic treatment did effect the LDL cholesterol levels. B. The confidence interval limits contain 0, suggesting that the garlic treatment did effect the LDL cholesterol levels. C. The confidence interval limits do not contain 0, suggesting that the garlic treatment did not effect the LDL cholesterol levels. D. The confidence interval limits contain 0, suggesting that the garlic treatment did not effect the LDL cholesterol levels.

Explanation / Answer

The best point estimate is 2.8 since it is the mode of the distribution.

99% confidence interval of mu is

(-3.28,8.88)

(b) Since the interval contains 0 it shows that it donot affect the LDL cholesterol levels.

And hence the answer is (D)

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