Weekly sales of copy paper at Dunder Mifflin Paper Company are provided in the table below. Compute a three-period moving average and a four-period moving average for weeks 5, 6, and 7. Compute the MAD for both forecasting methods. What is the forecast for week 8? (Hint: Calculate forecast using more accurate method) Week Sales (cases) 1 55 2 62 3 57 4 22 5 30 6 19 18 23 23.67 22.33 23.25 11.89 17.5