n a test of the effectiveness of garlic for lowering cholesterol, 44subjects 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 3.3and a standard deviation of 16.5.Construct a 95%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?