In a study of the effectiveness of garlic for lowering cholesterol, 17 subjects were treated with Garlicin, which is garlic in a processed tablet form. The measurement of interest is the change in LDL level. In the sample of 17 subjects, the sample mean was 3.205 with a sample standard deviation equal of 8.600. Assume all conditions are met to calculate a confidence interval from this data set.
Find a 90% confidence interval for the average change in the LDL level. Give your answer to 3 decimal places.