Lexus, Inc. In Exercise 12.77 we presentedsales data for the Lexus GX, a mid-sizesport
Chapter 13, Problem 14(choose chapter or problem)
Lexus, Inc. In Exercise 12.77 we presentedsales data for the Lexus GX, a mid-sizesport utility vehicle (SUV) sold in North American andEurasian markets by Lexus. The sales of the Lexus GX470 from its inception until 2009 are given in the table:3Total SalesGeneration Model(s) Calendar Year (United States)2002 2,1902003 31,3762004 35,420UZJ120 GX 470 2005 34,3392006 25,4542007 23,0352008 15,7592009 6,235a. Plot the data. What model would you expect to providethe best fit to the data? Write the equation ofthat model.b. Use a computer software package to fit the modelfrom part a.c. Find the least-squares prediction equation relating thesales of the Lexus GX 470 to the year of production.d. Does the model contribute significant informationfor the prediction of sales based on the year ofproduction? Use the appropriate p-value to makeyour decision.e. Find R2 on the printout. What does this value tellyou about the effectiveness of the multiple regressionanalysis?
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