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Confidence affect the sample size? required

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Question: A doctor wants to estimate the HDL cholesterol of all? 20- to? 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 2points with 99 % confidence assuming sigma= 14.1? Suppose the doctor would be content with 90 % confidence. How does the decrease in confidence affect the sample size? required?

90 % confidence level requires ( ) subjects.

?(Round up to the nearest whole number as? needed.)

Reference no: EM132152242

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