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. Month 7 8 Month 1 2 3 4 5 6 Demand 62 65 67 68 71 73 Demand 76 78 78 80 84 85 10 11 12 a. Calculate the simple three-month moving average forecast for periods 4 - 12. b. Calculate the weighted three-month average using weights of 0.50, 0.30, and 0.20 for periods 4 12. c. Calculate the simple exponential smoothing forecast for periods 2 12 using an initial forecast (F1) of 61 and an alpha of 0.30. d. Calculate the mean absolute deviation (MAD) for the forecasts made by each technique in periods 4 12. Which forecasting method do you prefer