Question

In order to test the effect of Gasohol on mileage, a research agency randomly selected two compact cars (same model) from each of four major manufacturers. Gasohol was used in one of each type of car and unleaded used in the rest. The mileage results for each car-fuel combination are given below.

Car |
Gasohol |
Unleaded |

Dodge |
31.5 mpg |
30.3 mpg |

Chevy |
28.9 mpg |
31.2 mpg |

Ford |
34.5 mpg |
32.8 mpg |

VW |
37.2 mpg |
35.7 mpg |

We would like to construct a 95% confidence interval for the difference in average mileage between gasohol and unleaded gasoline.

- Construct the confidence interval assuming the population of differences of gas mileages is normal.

Answer #1

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