Question: A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were

A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.

Miles / Gal Without Miles / Gal With
26.91 29.86
20.03 27.47
26.27 28.14
29.1 26.17
22.71 27.08
29.5 27.28
27.83 25.89

Determine the difference betweenthe sample mean mileageof the cars thataredriven without a booster and with a booster.

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