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W'Determine the difference between the sample mean mileage of the cars that are driven without a booster and with a booster. O 4.527 0 11.915 0 11.915 O 4 .527 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 / GalMiles / Gal Without With 23.5 26.11 24.9 29.52 20.29 29.04 21 .Cl 28.25 22.71 27.44- .27.176 28.89 22.59 29.25