Question

In a test of the effectiveness of garlic for lowering​ cholesterol, 49 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes ​(beforeminus−​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 5.2 and a standard deviation of 16.5 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 muμ​?

blank ​mg/dLless than<muμless than<blank​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 do not 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 affect the LDL cholesterol levels.

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

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

Answer 1