Final answer:
The response variable is Fuel efficiency. In regressions, the response variable is the outcome influenced by the independent variable.
Explanation:
The response variable in the question considering predicting a car's fuel efficiency in miles per gallon from the car's engine size is Fuel efficiency. The dependent variable in this scenario would be the Fuel efficiency, as it is the variable being predicted or influenced by the independent variable, which in this case is the Engine size. In regression analysis, the response variable is the outcome of interest being predicted or explained by the independent variable.
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