In a test of the effectiveness of garlic for lowering cholesterol,

4949

subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes

(beforeminusafter)

in their levels of LDL cholesterol (in mg/dL) have a mean of

3.43.4

and a standard deviation of

19.219.2.

Construct a

9090%

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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Question content area bottom

Part 1

What is the confidence interval estimate of the population mean

mu?

enter your response here

mg/dLless than

mg/dL

(Round to two decimal places as needed.)

Part 2

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

A.

The confidence interval limits

containcontain

0, suggesting that the garlic treatment

diddid

affect the LDL cholesterol levels.

B.

The confidence interval limits

do not containdonotcontain

0, suggesting that the garlic treatment

diddid

affect the LDL cholesterol levels.

C.

The confidence interval limits

do not containdonotcontain

0, suggesting that the garlic treatment

did notdidnot

affect the LDL cholesterol levels.

D.

The confidence interval limits

containcontain

0, suggesting that the garlic treatment

did notdidnot

affect the LDL cholesterol levels.