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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
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.
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