For your internship for the American Automobile Association (AAA), you are asked to analyze data related to 1978-1979 model automobiles. For this analysis, each car manufacturer provides the number of cylinders, the displacement, in cubic inches, the horsepower, in foot-pound-seconds, the drive ratio, the weight, in thousand pounds, and the make and model for each of its cars, and the Consumers' Union, through assessment on its test track, provides the measured gas mileage, in miles per gallon, for each automobile. For your analysis, you find it necessary to consider the gas mileage and the horsepower for these automobiles. Using one (1) sentence, identify the explanatory variable for this analysis and justify your selection.

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