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 - after) in their levels of LDL cholesterol (in mg/dL) have a mean of 2.7 and a standard deviation of 18.4. Construct a 90%confidence interval estimate of the minute change in LDL cholesterol after the garlic treatment what does the confidence interval suggest about the effectiveness of garlic and reducing LDL cholesterol?

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