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In: Statistics and Probability

In a test of the effectiveness of garlic for lowering​ cholesterol, 48 subjects were treated with...

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 ​(beforeminus​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 4.6 and a standard deviation of 15.9. Construct a 99​% 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 mu​? What does the confidence interval suggest about the effectiveness of the​ treatment? A. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels. B. The confidence interval limits contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels. C. The confidence interval limits contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels. D. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels.

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Expert Solution

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 minus ​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 4.6 and a standard deviation of 15.9.

What does the confidence interval suggest about the effectiveness of garlic in reducing LDL​ cholesterol?

The confidence interval includes the 0.

This means that there is no difference between the changes ​(before minus​after) in levels of LDL cholesterol​ (in mg/dL).

So we can conclude that garlic is not effective in reducing LDL​ cholesterol.

Answer:- The confidence interval limits contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.


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