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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=12.5 based on earlier​ studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size​ required?

Respuesta :

Step-by-step explanation:

confidence coefficient for 99% is 2.58

 

 2.58 * 19.4/sqrt(n) = 0.04

 

2.598*19.4/0.04 = sqrt(n)

 

 ( 2.598*19.4/0.04)^2  = n

 

1587676

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