TABLE 13-14
An automotive engineer would like to be able to predict automobile mileages. She believes that the two most important characteristics that affect mileage are horsepower and the number of cylinders (4 or 6) of a car. She believes that the appropriate model is
Y = 40 - 0.05X1 + 20X2 - 0.1X1X2
where X1 = horsepower
X2 = 1 if 4 cylinders, 0 if 6 cylinders
Y = mileage.
-Referring to Table 13-14, the fitted model for predicting mileages for 4-cylinder cars is ________.
A) 40 - 0.05X₁
B) 40 - 0.10X₁
C) 60 - 0.10X₁
D) 60 - 0.15X₁

Question

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The Answer of TABLE 13-14
An automotive engineer would like to be able to predict automobile mileages. She believes that the two most important characteristics that affect mileage are horsepower and the number of cylinders (4 or 6) of a car. She believes that the appropriate model is
Y = 40 - 0.05X1 + 20X2 - 0.1X1X2
where X1 = horsepower
X2 = 1 if 4 cylinders, 0 if 6 cylinders
Y = mileage.
-Referring to Table 13-14, the fitted model for predicting mileages for 4-cylinder cars is ________.
A) 40 - 0.05X₁
B) 40 - 0.10X₁
C) 60 - 0.10X₁
D) 60 - 0.15X₁

TABLE 13-14 An Automotive Engineer Would Like to Be Able to Predict