Solved: How many subjects are needed to estimate the hdl, Basic Statistics

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How many subjects are needed to estimate the hdl

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 standard deviation sigma = 19.4? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

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Basic Statistics: How many subjects are needed to estimate the hdl

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