20 Your manager is trying to determine what forecasting method to use. Based upon the following historical data, calculate the following forecast and specify what procedure you would utilize. ACTUAL DEMAND ACTUAL DEMAND MONTH MONTH 62 7 76 1 2 65 8 78 3 67 9 78 4 68 10 80 5 71 11 84 6 73 12 85 a. Calculate the simple three-month moving average forecast for periods 4-12. b. Calculate the weighted three-month moving average using weights of 0.50, 0.30, and 0.20 for periods 4-12. C. Calculate the single exponential smoothing forecast for periods 212 using an initial forecast (F1) of 61 and an a of 0.30. e. Calculate the mean absolute deviation (MAD) for the forecasts made by each technique in periods 412. Which forecasting method do you prefer