In a test of the effectiveness of garlic for lowering cholesterol, subjects were treated with raw garlic. Cholesterol levelswere measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (inmg/dL) have a mean of and a standard deviation of . Use a significance level to test the claim that with garlictreatment, the mean change in LDL cholesterol is greater than . What do the results suggest about the effectiveness of thegarlic treatment