9.2.41 Question Help * A doctor wants to estimate the mean HDL cholesterol of al

Question

9.2.41 Question Help * 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-15.3 based on earlier studies? 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 (Round up to the nearest subject.) Enter your answer in the answer box and then click Check Answer Clear All 0

Explanation / Answer

margin of error E =4

for 99% Ci critical z=2.5758

std deviation =15.3

sample size n=(Z*std deviation/E)2 =98

2) for 95% CI ; critical z=1.96

sample size n=(Z*std deviation/E)2 =57

sample size decreases if we reduce confidence level to 95%

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