4. A student is comparing accuracy of two forecasting methods. Calculate MAD and MSE. Which method is more accurate using MAD? Which method is more accurate using MSE? Actual Sales Forecast Method A Abs Error Error 5 5 Forecast Method B Abs Error Error -3 3 Error? 50 45 53 9 Error? 25 121 121 44 33 11 11 45 1 1 4 69 80 -11 11 73 16 77 80 -3 3 9 80 3 9 90 95 -5 5 25 85 5 25 100 110 -10 10 100 105 -5 5 25 Month January February March April May June July August September October November December Total 120 110 10 10 100 120 0 0 60 -4 4 60 4 16 80 -10 10 72 2 4 56 70 55 68 60 5 60 5 25 -5 -10 16 100 25 100 324 1,066 78 70 4 2 2 98 80 10 18 102 18 100 4 -14 923 -26 36 138