In Problem 14.5, you used displacement and maximum speed to predict power output of cars (stored in Cars ). Use the results from that problem, compute the coefficient of partial determination, \(r_{Y 1.2}^{2}\) and \(r_{Y 2.1}^{2}\), and interpret their meaning.

Problem 14.5

A car’s power output is influenced by several factors. A sample of 90 different car models of three makes from the European market is stored in the file Cars .

Develop a multiple linear regression model to predict power output (kW), based on engine size (displacement, in cubic centimeters) and maximum speed (km/h).