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

4 points with 99 %

99% confidence assuming sigma equals 19.5 question mark 

σ=19.5? Suppose the doctor would be content with 95 %

95% confidence. How does the decrease in confidence affect the sample size​ required?

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