Confidence Level Questions statistics homework help
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 33 points with 99% confidence assuming s = 17.6 based on earlier​ studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size​ required?
a) A​ 99% confidence level requires ____ subjects. ​
(Round up to the nearest​ subject.)
b) A​ 90% confidence level requires ____ subjects. ​
(Round up to the nearest​ subject.)
c)How does the decrease in confidence affect the sample size​ required?
