Use a multiple regression model with dummy variables as follows to develop an equation to account for seasonal effects in the data. qtr1 = 1 if quarter 1, 0 otherwise; qtr2 = 1 if quarter 2, 0 otherwise; qtr3 = 1 if quarter 3, 0 otherwise. if required, round your answers to three decimal places. for subtractive or negative numbers use a minus sign even if there is a + sign before the blank. (example: -300) if the constant is "1" it must be entered in the box. do not round intermediate calculation.