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 3 points with 99% confidence assuming s = 19.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

Reference no: EM132184482

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