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A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many...

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 ?=15.4?

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

A 99% confidence level requires subjects.

(Round up to the nearest whole number as needed.)

Math   Statistics-And-Probability   
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