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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=17.8?

Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

 
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