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 ACTUAL DEMAND 123456789 63 66 68 69 71 74 77 78 78 10 81 83 84 11 12 a. Calculate the simple three-month moving average forecast for periods 4 to 12. Note: Round your answers to 3 decimal places. Answer is complete and correct. Three-Month Month Moving Average 4 65.667 5 67.667 6 69.333 7 71.333 8 74.000 9 76.333 10 77.667 11 79.000 b. Calculate the weighted three-month moving average for periods 4 to 12 using weights of 0.40 (for the period t-1); 0.30 (for the period t-2), and 0.30 (for the period t-3). Note: Do not round intermediate calculations. Round your answers to 1 decimal place. Month Answer is complete and correct. Three-Month Weighted Moving Average 4 65.4 5 67.5 6 69.2 7 71.1 8 73.8 9 76.1 10 77.6 11 78.9 12 80.4 c. Calculate the single exponential smoothing forecast for periods 2 to 12 using an initial forecast (F1) of 62 and an of 0.20. Note: Do not round intermediate calculations. Round your answers to 3 decimal places. Month 2 Answer is complete and correct. Single Exponential Smoothing Forecast 62.800 3 62.640 4 63.510 5 64.920 6 65.740 7 67.610 8 69.400 9 71.920 10 72.550 11 74.240 12 75.920 d. Calculate the exponential smoothing with trend component forecast for periods 2 to 12 using an initial trend forecast (T) of 1.70, an initial exponential smoothing forecast (F1) of 61, an of 0.20, and a of 0.40. Note: Do not round intermediate calculations. Round your answers to 3 decimal places. Month 2 3 4 5 6 7 8 9 10 11 12 Answer is not complete. Three-Month Weighted Moving Average e-1. Calculate the mean absolute deviation (MAD) for the forecasts made by each technique in periods 4 to 12. Note: Do not round intermediate calculations. Round your answers to 3 decimal places. Three-month moving average Three-month weighted moving average Single exponential smoothing forecast Exponential smoothing with trend e-2. Which forecasting method is best? Mean Absolute Deviation Three-month moving average Single exponential smoothing forecast Three-month weighted moving average Exponential smoothing with trend forecast