... 360, as the forecast for week 2, the error for week 2 is:Error (week 2) ϭ Actual (week 2) Ϫ Forecast (week 2) ϭ 410 Ϫ 360 ϭ 50The forecast for week 3 will be:Forecast (week 3) ϭ Forecast (week ... appropriate seasonal component:Forecast for spring, year 4 ϭ 25.475 ϩ (4 * 0.554) ϩ 12 .166 ϭ 39.857Forecast for summer, year 4 ϭ 25.475 ϩ (5 * 0.554) ϩ 12.228 ϭ 40.473Forecast for autumn, year 4 ϭ 25.475 ... to:(a) Ascertain the seasonal components for each quarter.(b) Compute the mean squared deviation (MSD) for the model.312 Quantitative methods for business Chapter 9use the equation to project...