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= 19.2 based on earlier studies? Suppose the doctor would be content wil 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) Partial Critical Value Table Level of Confidence, (1-a) 100% 90% 95% 99% Area in Each Tail. 0.05 0.025 0.005 Print α 2 Done Critical Value, Za/2 1.645 1.96 2.575 X

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