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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 4 points with 99% confidence assuming sigma=17.8?

Suppose the doctor would be content with 95% confidence, how does the decrease in confidence affect the sample size required?

 
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