Question: A major oil company wanted to estimate the difference in average mileage for cars using regular engine oil compared with cars using a synthetic-oil product. The company used a paired-sample approach to control for any variation in mileage arising because of different cars and drivers. A random sample of 10 motorists (and their cars) was selected. Each car was filled with gasoline, the oil was drained, and new, regular oil was added. The car was driven 200 miles on a specified route. The car then was filled with gasoline and the miles per gallon were computed. After the cars completed this process, the same steps were performed using synthetic oil. (Use EXCEL)