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?
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
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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