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A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How...
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=19.1 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?
A 99% confidence level requires?
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