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see attached 7. (10 pts) A research worker Wishes to estimate the mean of a population using a sample large enough that the probability will

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7. (10 pts) A research worker Wishes to estimate the mean of a population using a sample large enough that the probability will be 0.95 that the sample mean will not differ from the population mean by more than 25 percent of the standard deviation. How large a sample should she take

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