Quarterly sales of three years are below:
Exhibit1
Quarter Year 1Year2Year3
1
923
1,1121,243
2
1,0561,1561,301
3
1,124-1,1241,254
4
992
1.0781,198
Using the "quarterly seasonality with trend"model, the quarter1 forecast for year 5 is a.560 Ob.980 c.1431 Od.1092