A researcher wants to know if the octane level of gasoline affects the gas mileage of a car. She randomly selects 10 cars and puts 5 gallons of 87-octane gasoline in the tank. On a closed track, each car is driven at 50 miles per hour until it runs out of gas. The experiment is repeated, with each car getting 5 gallons of 92-octane gasoline. The miles per gallon for each car are then computed. The results are shown. Would you recommend purchasing 92 octane? Why or why not?

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87 Octane 92 Octane 87 Octane 92 Octane 22.8 18.0 18.5 23.4 23.2 23.1 23.1 23.5 31.5 31.9 19.0 19.5 26.8 24.9 26.7 26.2 24.1 25.1 31.8 30.7