Question

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

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
44
points with
99 %99%
confidence assuming
s equals 18.9s=18.9
based on earlier studies? Suppose the doctor would be content with
95 %95%
confidence. How does the decrease in confidence affect the sample size required?


​A 99% confidence level requires 149149 subjects. ​(Round up to the nearest​ subject.)

A 95 %95% confidence level requires 8686 subjects. ​(Round up to the nearest​ subject.)
How does the decrease in confidence affect the sample size​ required?

A.
The sample size is the same for all levels of confidence.
B.
Decreasing the confidence level decreases the sample size needed.
C.
Decreasing the confidence level increases the sample size needed.

what is the answer.... A,B or C?

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