Question: 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

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?

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

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