Many drivers of cars that can run on regular gas actually buy premium gas in the belief that they'll get better gas mileage. To test that belief, a consumer research group evaluated the 6 cars and the results (miles per gallon) are shown below: Car No Regular Gas Premium Gas 16 19 20 22 27 26 aUAWNH 25 26 27 28 20 24 At 4% level of significance, is there evidence that cars get better gas mileage on average with premium gasoline? Note: Subscript 1 refers to the regular gas, subscript 2 refers to the premium gas, and D refers to the difference in the mileage between regular gas and premium gas. Subscript 1 denotes the numerator and subscript 2 denotes the denominator. Round all numerical answers to 4 decimal places