Seasonalized Forecasts 27. A computer manufacturer wants to develop next year's quarterly forecasts of sales revenues for its line of personal computers. The company believes that the most recent eight quarters of sales should be representative of next year's sales Sales (millions of dollars) Sales (millions of dollars) Year Ouarter Year Ọuarter 9.2 5.4 4.3 14.1 2 10.3 6.4 5.4 16.0 2 4 4 Use seasonalized time series regression analysis to develop a forecast of next year's quarterly sales revenues for the line of personal computers