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 4 points with 99% confidence assuming s=15.1 based on earlier​ studies? Suppose the doctor would be content with 90% confidence.        Question content area bottom Part 1 A​ 99% confidence level requires    ​(Round up to the nearest​ subject.) Part 2 A 90% confidence level requires    ​(Round up to the nearest​ subject.) Part 3 How does the decrease in confidence affect the sample size​ required?

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