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Suppose that you are interested in determining the cost of tuition and fees at universities in the United States. Suppose that we (unrealisitically) know that the standard deviation in all tuition costs is $1000 per semester. You decide to take a sample and dtermine a 90% confidence interval for the mean cost, and you want your estimate to be accurate to within $500. What is the minimum size necessary to construct this confidence interval?

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