THIS QUESTION IS NOT SAME AS THE OTHER INES THAT ARE IN CHEGG! THE NUMBERS ARE DIFFERENT. Please answer the following questions in details. Thank you.

4. 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 1 2 3 4 5 6 Forecast 810 830 950 960 1010 975 Actual 900 1000 1050 900 900 1100 Compute the MAD and tracking signal. Then decide whether the forecasting model you have been using is giving reasonable results