The manager of the Bayville police department motor pool wants to develop a forecast model for annual maintenance on police cars, based on mileage in the past year and age of the cars. The following data have been collected for eight different cars:

a. Using Excel, develop a multiple regression equation for these data.
b. What is the coefficient of determination for this regression equation?
c. Forecast the annual maintenance cost for a police car that is 5 years old and will be driven 10,000 miles in 1year.

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Miles Driven Car Age (yr.) Maintenance Cost $1,200 1,400 1,820 16.320 15,100 18,500 10,200 9,175 12.770 8,600 7,900 650 875