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 Error Forecast Error Method B Abs Error Error -3 3 -1 1 SO 45 25 53 9 44 33 11 11 121 45 1 69 80 -11 11 121 73 -4 4 16 77 80 -3 3 9 80 -3 3 9 90 95 -5 5 25 85 5 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 10 100 120 0 0 0 10 4 56 60 -4 16 60 -4 4 16 -10 10 72 -2 2 70 SS 80 60 100 25 4 25 -5 5 60 -5 5 68 78 -10 10 100 70 -2 2 4 98 80 18 18 324 100 -2 2 4 -14 102 1,066 923 -26 36 138