Question: The distribution of blood cholesterol level in the population of young men aged 20 -34 years is close to Normal with standard deviation of s = 41 milligrams per deciliter (mg/dl). You measure the blood cholesterol of 14 cross country runners. The mean level is \[\overline{x}\] = 172 mg/dl. Assuming that s is the same as in the general population, give a 90% confidence interval for the mean level m among cross-country runners.