The following two demand sets are to be used to test two different basic exponential smoothing models. The first uses an of 0.1 while the second uses an of 0.5. In both cases the model should be initialised with a beginning forecast of 50, that is the ESF forecast for Period 1 made at the end of Period 0 is 50 units. In each of the four cases (two models on two demand sets) compute the average forecast error and MAD. What do the results mean? Note: Feel free to use Excel to solve this assignment if required. Demand Set 1 Demand Set 2 Period Demand Period Demand 1 51 1 77 2 46 2 83 3 49 3 90 4 55 4 22 5 52 5 10 6 47 6 80 7 51 7 16 8 48 8 19 9 56 9 27 10 51 10 79 11 45 11 73 12 52 12 88 13 49 13 15 14 48 14 21 15 43 15 85 16 46 16 22 17 55 17 88 18 53 18 75 19 54 19 14 20 49 20 16