A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99%

confidence assuming s=19.6 based on earlier studies? Suppose the doctor would be content with

95% confidence. How does the decrease in confidence affect the sample size required?

Question content area bottom

Part 1

A 99% confidence level requires enter your response here subjects. (Round up to the nearest subject.)