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3. Suppose that the following were sales of beer at a local store by quarters over...

3. Suppose that the following were sales of beer at a local store by quarters over a two-year period. 2003 2004 Quarter 1 2 3 4 1 2 3 4 Demand 300 350 680 500 320 370 720 550 a. Considering deseasonalizing and reseasonalizing, apply MA(3) to predict the demand for the first quarter of 2005. (20 pts) b. Calculate the MAD (mean absolute deviation). (10 pts)

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