Two independent methods of forecasting based on judgment and experience have been prepared each month for the past 10 months. The forecasts and actual sales are as follows: Month Sales Forecast 1 Forecast 2 1 835 840 785 2 845 780 805 3 805 800 800 4 795 825 855 5 770 795 790 6 835 780 791 7 810 810 755 8 835 790 805 9 830 815 815 10 830 840 830 a. Compute the MSE and MAD for each forecast. (Round your answers to 2 decimal places.) b. Compute MAPE for each forecast. (Round your intermediate calculations to 5 decimal places and final answers to 4 decimal places.) c. Prepare a naive forecast for periods 2 through 11 using the given sales data. Compute each of the following; (1) MSE, (2) MAD, (3) tracking signal at month 10, and (4) 2s control limits. (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.)