Save Answer Question 2 1 points The numbers of copies of a college textbook sold quarterly over the past four years has trend and seasonal pattern, to forecast the quarterly sales of the textbook, the following regression equation was found: yt = 2120 - 620 Qtr1 - 1320 Qtr2 + 290 Qtr3 + 24 t, where Qtri, Qtr2and Qtr3 are dummy variables corresponding to Quarters 1, 2 and 3, and t = time period. The sales forecast for Quarter 4 of the next year is O a. 2026 Ob. 2251 Oc 1325 O d. 2600 A Moving to another question will save this response.