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StatisticsQ&A LibraryIn a test of the effectiveness of garlic for lowering cholesterol, 42 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 3.9 and a standard deviation of 18.8. 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? a. What is the confidence interval estimate of the population mean μ?b. What does the confidence interval suggest about the effectiveness of the treatment?Question

Asked Mar 25, 2020

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In a test of the effectiveness of garlic for lowering cholesterol, 42 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 3.9 and a standard deviation of 18.8. 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?

a. What is the confidence interval estimate of the population mean μ?

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

Step 1

(a)

The 90% confidence interval estimate of the population mean µ is,

Thus, the 90% confidence interval estimate of the population mean µ is (-0.982, 8.782).

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