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Homework Help: 7 STATS MATHGURU PLEASE HELP

Posted by Megan on Sunday, May 5, 2013 at 5:51pm.

A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99%confidence assuming s=17.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in cofidence affect the sample size required?

A: A 99% confidence level requires ___ subjects

B: A 90% confidence level requires ___ subjects

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