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 2 points with 99% confidence assuming s-17.8 based on earlier studies. Suppose the doctor would be content with 90 % confidence.
A) A 99% confidence level requires ___ subjects
B) A 90% confidence level re
quires____ subjects?
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