A Doctor Wants To Estimate The Mean Hdl Cholesterol Of All 20 To 29 Year Old Females How Many Subjects Are Needed To Es 1 (24.63 KiB) Viewed 92 times
A Doctor Wants To Estimate The Mean Hdl Cholesterol Of All 20 To 29 Year Old Females How Many Subjects Are Needed To Es 2 (24.74 KiB) Viewed 92 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 2 points with 99% confidence assuming s = 17.2 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 491 subjects. (Round up to the nearest subject) A 90% confidence level requires 200 subjects(Round up to the nearest subject)
Critical Value, za /2 Area in Each Tail, 2 Level of Confidence, (1 -a). 100% 90% 95% 99% 0.05 0.025 0.005 1.645 1.96 2.575
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