A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed...

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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

4
 

points with

99 %
 

confidence assuming

s equals 11.7
 

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
[removed]
 

subjects. (Round up to the nearest subject.)

    • 10 years ago
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