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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 estimate the mean HDL cholesterol within 3
points with 99% confidence assuming s = 14.2 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in
confidence affect the sample size required?
adebook
A 99% confidence level requires
subjects(Round up to the nearest subject.)
ultimedia Library
A 90% confidence level requires
subjects. (Round up to the nearest subject)
aface to the Student
How does the decrease in confidence affect the sample size required?
pols for Success
O A. Decreasing the confidence level decreases the sample size needed.
B. The sample size is the same for all levels of confidence.
OC. Decreasing the confidence level increases the sample size needed.
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