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Five years ago, the average apartment rent in southwest Virginia was $895 per month. A recent...

Five years ago, the average apartment rent in southwest Virginia was $895 per month. A recent study of 180 randomly selected apartments found that the average rent was $915, with a standard deviation of $227.50. Do the data enable us to conclude that rents have increased? An appropriate set of null and alternative hypotheses to use in order to determine whether the average rent has increased is:

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