2. Two independent methods of forecasting based on judgment and experience have been prepared for monthly sales of Widgets. Foreca st #2 Foreca st #1 (A - F) Error (A - F) Error Month Sales Error2 [e] Error2 [e] 1 9 3 -3 4 1 6 1 36 1 6 2 16 4 2 4 2 -14 196 14 3 4 5 6 Foreca st 773 785 792 784 772 768 763 771 786 788 Foreca st 769 783 792 794 774 766 759 771 788 784 -4 770 789 794 780 768 772 760 775 786 790 16 4 6 7 -3 9 3 6 1 4 36 1 16 1 8 4 4 4 16 0 9 0 0 10 6 36 6 a. Compute the MAD and MSE for each forecast, does either method seem superior? Explain. b. Compute a tracking signal for the 10th month for each forecast. What does it show? (Use action limits of + or - 4.) c. Compute 2s control limits for each forecast. What do they show