Using multiple regression The Sure-Built Housing Company manufactures modular homes and uses a multiple regression model to predict monthly housing sales units for its nationwide operations. The average selling price of the modular homes is $22,750. The variables used in the regression are:

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Ye Sure-Built housing sales in units = X1 = X2 = X3 = X4 = average family income average 30 year fixed rate mortgage expressed as a percentage number of new jobs created nationally during the month increase in population The regression equation is: Yc 1,150.015X1450X2 + .12X3 + .06X4 multiple r = .731 For the month of July, average family income was $22,500, 30-year fixed mortgage rate was 10.5 percent, number of new jobs created nationally was 56,000, and the increase in population was 80,000.