A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females
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 = 14.8? Suppose the doctor would be content with 95 % confidence. How does the decrease in confidence affect the sample size required? A 99% confidence level requires __ subjects.
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