Multiple Choice Question A response variable, Price, is defined as the selling price of a used car. Three predictor variables include, Age, the age of the car in years, Mileage, the mileage of the car in thousands of miles, and Cylinders, the number of engine cylinders. The estimated regression equation is: Price = 10,000 - 1800Age - 50Mileage + 1200Cylinders. If the estimated price of a used car is $8700 and the actual selling price is $9000, residual is Multiple choice question. unknown without knowing se unknown without knowing the x values. -$300 ei = $300