SOLUTION: A doctor wants to estimate the HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 4 points with 99

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Question 1043428: A doctor wants to estimate the HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 4 points with 99% confidence assuming σ=12.7? 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 how many subjects? Round to the nearest whole number
Answer by stanbon(75887) About Me  (Show Source):
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A doctor wants to estimate the HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 4 points with 99% confidence assuming σ=12.7?
n = [2.5758*12.7/4]^2
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Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size​ required?
Sample size will be smaller to achieve that smaller level of confidence.
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A​ 99% confidence level requires how many subjects? Round to the nearest whole number.
Ans:: 67 when rounded up
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Cheers,
Stan H.
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