a test of the effectiveness of garlic for loweringcholesterol, 45 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 3.7 and a standard deviation of 19.5 . Construct a 90 % confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the