QUESTION 5 A government agency wants to test a refining company's claim that the mileage achieved with its unleaded gasoline (A) is at equal or less than that achieved with its leaded gasoline (B). Fifteen car models are chosen; a given driver drives each model twice over the identical route. At random, each driver is given brand A or brand B first, then drives with the other brand during the second trip. This procedure is designed to conduct a sign test at the 2.5 percent level of significance is chosen. Make the test, using the government's following Table data. TABLE: Gasoline Experiment Miles per Gallon Car Model Unleaded Gas (A) 1.caded Gas (B) 22.1 23.7 15.7 16.1 2 3 18.2 19.0 4 19.0 19.0 5 25.7 24.2 6 19.2 7 11.9 8 9 28.0 35.0 10 27.0 22.0 12.1 30.2 37.8 30.0 19.0 15.1 23.4 207 28.1 11 12 13 14 19.7 163 21.2 22.2 27.8 15