In a test of garlic lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The change of LDL levels had a mean of 0.4 and a population standard deviation of 21. Construct a 95% confidence interval of the mean net change in LDL after garlic treatment. What does the confidence interval suggest about the effectiveness of garlic lowering LDL cholesterol?

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To construct the confidence interval for the mean net change in LDL after garlic treatment we can us... View the full answer