Equal slopes for car prices? Refer to Exercise 13.41, with 
= predicted selling price of used car and 
1 = age of car. When equations are fitted separately for U.S. and foreign cars, we get = 23,417 
1,7151 for U.S. cars and = 15,536 – 5571 for foreign cars.
a. In allowing the lines to have different slopes, we allow for an ____________ between age and type of car in their effects on the price. (Fill in the correct word.)
b. Predict by how much the price changes for a one-year increase in the age of the car. Do you need to do this separately for each type of car? Explain.
c. Based on the separate prediction equations, find the predicted price of a (i) U.S. and (ii) foreign car that is eight years old.
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