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 equals 17.3

based on earlier studies? Suppose the doctor would be content with

90 %

confidence. How does the decrease in confidence affect the sample size required?

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A 99% confidence level requires

nothing

subjects. (Round up to the nearest subject.