Question: In 2004, a small dealership leased 21 Chevrolet Impalas on 2-year leases. When the cars were returned in 2006, the mileage was recorded (see below). Is the dealer’s mean significantly greater than the national average of 30,000 miles for 2-year leased vehicles, using the 10 percent level of significance? Mileage

40,060                  24,960                  14,310                  17,370                  44,740                  44,550                  20,250

33,380                  24,270                  41,740                  58,630                  35,830                  25,750                  28,910

25,090                  43,380                  23,940                  43,510                  53,680                  31,810                  36,780

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