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We wish to measure the average prevalence of a chemical in

We wish to measure the average prevalence of a chemical in the population. The measurement is done by a blood test. We expect the standard deviation in the population to be about 300ppm. If we want to know the average to within 200ppm with a confidence of 95%, how many people do we need to test?

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Basic Statistics: We wish to measure the average prevalence of a chemical in

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