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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 1 830 915 2 865 1,015 3 965 1,050 4 965 925 5 1,015 930 6 1,010 1,025 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 Sum of Absolute Deviation Deviation RSFE Deviation MAD TS Week Forecast 1 830 2 865 3 965 4 965 5 5 1,015 6 1,010 Actua 915 1,015 1,050 925 930 1,025 b. Decide whether the forecasting model you have been using is giving reasonable results. The forecasting model is unacceptable The forecasting model is acceptable