20. Problem 16 in Chapter 11 described a study examining the effect of eating oatmeal regularly on cholesterol.

Cholesterol was measured before and after adding oatmeal to the diet of a sample of n 9 participants.

For this sample, cholesterol scores averaged MD 16 points lower with the oatmeal diet with SS 538 for the difference scores. Use the data to estimate how much effect oatmeal would have on the cholesterol level for the general population. Make a point estimate and a 95% confidence interval estimate of the population mean difference.