4. To estimate market potential for the garden tractor division of the M-F Implement Co., Mark Haynes, the statistician, estimated the following relationship using multiple regression analyses:

Vaart DX At Dak, tA, where Y = unit sales of U.S. garden tractors X, = number of single-family homes X, = disposable personal income X, = index of food prices X, = family size Using data for 2006-2012, R? = 65.0 was obtained. Should this method be used to predict market potential?