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In a test of the effectiveness of garlic for lowering cholestero l,42 subjects were treated with...

In a test of the effectiveness of garlic for lowering cholestero l,42 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 4.1and a standard deviation of 17.3 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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The confidence interval limits contain 0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.

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