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A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females

/in /by

A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many subjects

are needed to estimate the HDL cholesterol within   3 points with  99% confidence assuming  σ=12.5? 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  how many subjects. (Round up to the nearest whole number as needed.)

 
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