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 3 points with 99% confidence assuming s=14.9 based on earlier​ studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size​ required? A​ 99% confidence level requires _______subjects. A​ 90% confidence level requires_______subjects.

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Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

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