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A doctor wants to estimate the mean HDL cholesterol of all 20- to - 29 year old females. How many subjects are needed to estimate

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- 18.4 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

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