In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after treatment. The changes before and after in their levels of LDL cholesterol (in mg/dL) have a mean of 5.6 and a standard deviation of 17.4. Construct a 90% confidence interval estimate of the mean net chance in LDL cholesterol after the garlic treatment