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Confidence interval for the population mean weight

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Reference no: EM132157667

Suppose Fawn plans to take a sample to determine a 90 percent confidence interval for the population mean weight of chocolate in every package. She wishes the confidence interval to be of the form "plus or minus 3 grams," and is willing to assume that the population standard deviation is equal to 12 grams. How large a sample should she take?

Reference no: EM132157667

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