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Drug Trials: Sample Size Requirement

A drug manufacturer wants to estimate the effect of its new drug designed to increase patients white blood cell count. How many sample runs of the drug must be performed to ensure that the estimate is accurate to within 50 cells (per microliter of blood) at 95% confidence? Assume the population standard deviation to be 110 cells.

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The margin of error ME<=50, the population standard deviation sigma=110 cells. For 95% confidence, z=1.96. So, we use a ...

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