A how many subjects are needed to estimate the hdl


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

(a) How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming σ=14.2?

(b) Suppose the doctor would be content with 90% confidence.

(c) How does the decrease in confidence affect the sample size required?

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