Thefinancial aid office wishes to estimate the mean cost of textbooks per quarter forstudents at a particular university. For the estimate to be useful,it should be within$20 of the true population mean. How large a sample should be used to be 95% con-fident of achieving this level of accuracy?To determine the required sample size,we must have a value for s. The finan-cial aid office is pretty sure that the amount spent on books varies widely,with mostvalues between $50 and $450

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