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

A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 4

points with 99 %confidence assuming =15.4? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

A99% confidence requires how many subjects?

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