A doctor wants to estimate the mean HDL cholesterol of all20- to29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4

4 points with 99 %

99% confidence assuming s equals 14.9

s=14.9 based on earlierstudies? Suppose the doctor would be content with 90 %

90% confidence. How does the decrease in confidence affect the sample sizerequired?

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A99% confidence level requires

264

264 subjects. (Round up to the nearestsubject.)