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Decrease in confidence affect the sample size required

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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 22 points with 99% confidence assuming s equals 12.8 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 99% confidence level requires ___ subjects?

Reference no: EM132173785

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