a) Without Time Year Quarter Sales Q1 Q2 Q3 Time Q3 (43 points) The quarterly sales data for Mama's Pizza in NYC over the past 4 years are shown here. 1453 The columns for dummy variables Q1, Q2, Q3, and time variable are already set up. 703 2389 a) (15 points) Obtain quarterly forecasts for year 5 using a regression model without the Time variable. 2264 b) (15 points) Obtain quarterly forecasts for year 5 using a regression model with the Time variable, 2 1565 c) (10 points) Which model fits the data better? Argue (3 bonus). 771 2664 2124 3 1615 864 2697 2379 4 1737 934 o o o - 2914 2445 16 5