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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 1 870 915 2 765 915 3 865 965 4 865 815 5 915 815 6 890 1,040 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.) Week Forecast Actual Deviation Running Sum of Forecast Errors Absolute Deviation Sum of Mean Absolute Absolute Deviation Deviation Tracking Signal 870 765 865 1 2 3 4 5 6 915 915 965 815 815 1,040 865 915 890 b. Decide whether the forecasting model you have been using is giving reasonable results. The forecasting model is unacceptable The forecasting model is acceptable