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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 the mean HDL

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=14.2 based on earlier studies? Suppose the doctor would be content with

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

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