TABLE 14-14
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 - 0.1X₁ X₂
where X₁ = horsepower
X₂ = 1 if 4 cylinders,0 if 6 cylinders
Y = mileage
-Referring to Table 14-14,the fitted model for predicting mileages for 6-cylinder cars is ________.

Question

Quizplus · Accepted Answer

The fitted model for predicting mileages for 6-cylinder cars is 40 - 0.05X₁ because the coefficient for XS1U1B12S1U1B0 (which is 1 for 4-cylinder cars and 0 for 6-cylinder cars) is 0 in this model.

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