Regression Analysis with T = 1 to 40 Was Used $=1500+5 t+1.5 Q_{1}+1.8 Q_{2}-3.0 Q_{3}$

Essay

Regression analysis with t = 1 to 40 was used to develop the following equation: $=1500+5 t+1.5 Q_{1}+1.8 Q_{2}-3.0 Q_{3}$ ,
where: $Q _ { i }$ = 1, if quarter i (i = 1, 2, 3)
= 0, otherwise.
Forecast the next four quarters.