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Find the sample size needed to assure with 98 percent

The weekly earnings of students in one age group are normally distributed with a standard deviation of 39 dollars. A researcher wishes to estimate the mean weekly earnings of students in this age group. Find the sample size needed to assure with 98 percent confidence that the sample mean will not differ from the population mean by more than 2 dollars.

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Business Economics: Find the sample size needed to assure with 98 percent

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