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Problem 3-20 In this problem, you are to test the validity of your forecasting model. Here are the forecasts for a model you have been using and the actual demands that occurred: WEEK FORECAST ACTUAL 1 730 860 2 810 960 3 910 1,010 4 910 860 5 960 860 6 935 1,010 a. Use the method stated in the text to compute the MAD and tracking signal for each week. (Negative values should be indicated by a minus sign. Round your "Tracking Signal" to 1 decimal place and all other answers to the nearest whole number.) Absolute Deviation Sum of Absolute Deviation Deviation RSFE MAD TS Week Forecast 1 730 Actual 860 2 810 960 1,010 3 4 910 910 860 5 860 960 935 6 1,010 b. Decide whether the forecasting model you have been using is giving reasonable results. The forecasting model is acceptable The forecasting model is unacceptable