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8 points Save Answer EPA miles per gallon ratings are obtained for all models of cars sold in the United States. One of these figures purports to represent mileage in combined city-country driving. Suppose a consumer group test drives 9 cars of a model with an EPA rating of 24.5 miles per gallon. Assume that population standard deviation o (sigma) is equal to 2.1. Compute a 99% confidence interval (CI) for the true mean mileage. Please show all your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt V A V