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A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HD cholesterol within 4 points with 99% confidence assuming the Q = 17.9? Suppose the Doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?

A 99% confidence level requires subjects.

Because a 95% confidence interval is required .04 points. Use a standard normal table to find the critical value.

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