Question
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 (beforeminusafter) 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 minusafter) 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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