A doctor wants to estimate the hdl cholesterol of all 20-, Ask an Expert

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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 3 points with 99% confidence assuming Î±= 18.9? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

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