Globetron manufactures components for use in small electronic products such as computers, printers, car audio systems, and smartphones at plants in Belgium, Germany, and France. The parts are transported by truck to Hamburg, where they are shipped overseas to customers in Mexico, South America, the United States, and the Pacific Rim. The company has to reserve space on ships in advance, and thus needs an accurate forecasting model. Following are the number of cubic feet of container space the company has used in each of the past 18 months:

For (1)-(4) below, compute the forecasted shipping space required using: 1)Three month moving average for months 4 through 19. (2 points) 2)Three month weighted moving average for months 4 through 19, with weights 0.5 for the most recent month, 0.3 for the next most recent month and 0.2 for the distant month. (2 points) 3) Exponential smoothing for months 2 through 19, with = 0.8. (2 points) 4) Adjusted exponential smoothing for months 2 through 19, with = 0.8 and = 0.6. (4 points) 5) Compare the accuracy of the above four forecasting models using MAD (mean absolute deviation) (12 points) 6) Which of the above four forecasting models would you recommend and why ?