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 2 points with 99% confidence assuming s= 14.5 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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A 99% confidence level requires 349 subjects. (Round up to the nearest subject.)
A 95% confidence level requires
subjects. (Round up to the nearest subject)