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A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How...

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 44 points with 99%confidence assuming s equals 16.7s=16.7 based on earlier​ studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size​ required?

A​ 99% confidence level requires blank subjects. ​

A 95 %95% confidence level requires blank subjects.

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