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= 10.2 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 Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) A 95% confidence level requiresO subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? Partial Critical Value Table O A. Decreasing the confidence level decreases the sample size needed. OB. The sample size is the same for all levels of confidence. OC. Decreasing the confidence level increases the sample size needed. Critical Value,a/2 Level of Confidence, (1-a)• 100% Area in Each Tail. a 2 0.05 0.025 .005 1.645 1.96 2.575 90% 95% 99% Print Done

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.