An environmentalist wonders whether cars get better gas mileage when using regular or premium gas. To test this, she selects 10 cars from a rental company. Each car is filled first with either regular or premium gasoline, decided by a coin toss, and the mileage for that tankful is recorded. Then the mileage is recorded again or the same cars for a tankful of the other kind of gasoline. The data is provided below: Car # 1 2 3 4 5 6 7 8 9 10 Regular 16 20 21 22 23 22 27 25 27 28 Premium 19 22 24 24 25 25 26 26 28 32   Using a hypothesis test, determine if there is evidence that cars get significantly better fuel economy with premium gasoline.

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.