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 ​(before−​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 3.5 and a standard deviation of 18.3. 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?

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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 ​(before−​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 3.5 and a standard deviation of 18.3. 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 μ​?

 

______​mg/dL < μ < _______  ​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 not affect the LDL cholesterol levels.

B.

The confidence interval limits

do not 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 affect the LDL cholesterol levels.

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