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. a. Calculate the simple three-month moving overage forecast for petiods 4-12. (Round your answers to 3 decimol places.) b. Calculate the weighted three-month moving average for periods 412 using weights of 0.40 (for the period t1) : 0.40 (for the period t2). and 0.20 (for the period t-3). (Do not round intermediate calculations. Round your answers to 1 decimal place.) c. Calculate the single exponential smoothing forecast for periods 212 using an initial forecast (F ) of 63 and an a of 0.30 . (Do not round intermediate calculations. Round your answers to 3 decimal places.) d. Calculate the exponential smoothing with trend component forecast for periods 212 using an initial trend forecast ( 1 t of 1.80 , an initial exponential smoothing forecast ( F$ of 62 , an of 0.30 , and a of 0.40 . (Do not round intermediate caleulations. Round your answers to 3 decimol places.) e-1. Calculate the mean absolute devlation (MAD) for the forecasts made by each technique in periods 4-12 (Do not round intermediate calculations. Round your onswers to 3 decimal ploces.) e-2. Which forecasting method is best? Three-month weighted moving average Single exponential smoothing forecast Three-month moving average Exponentialsmoothing with trend forecast