Consider the following quarterly time series.

Quarter	Year 1	Year 2	Year 3
1	923	1,112	1,243
2	1,056	1,156	1,301
3	1,124	1,124	1,254
4	992	1,078	1,198

a. Construct a time series plot. What type of pattern exists in the data? b. 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.

c. Compute the quarterly forecasts for next year based on the model developed in part b.