A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to e

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A Doctor Wants To Estimate The Mean Hdl Cholesterol Of All 20 To 29 Year Old Females How Many Subjects Are Needed To E 1 (60.8 KiB) Viewed 27 times

A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s = 18.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) Partial Critical Value Table Level of Confidence, (1-x) 100% 90% 95% 99% Area in Each Tail, 0.05 0.025 0.005 α 2 Critical Value, Zα/2 1.645 1.96 2.575 X