Need help on 4

Question 4- Sales for the past 12 months at Computer Success are given here. a) Use a 3-month moving average to forecast the sales for the months May through December. b) Use a 4-month moving average to forecast the sales for the months May through December. c) Compare the performance of the two methods by using the mean absolute deviation as the performance criterion. Which method would you recommend? d) Compare the performance of the two methods by using the mean absolute percent error as the performance criterion. Which method would you recommend? e) Compare the performance of the two methods by using the mean squared error as the performance criterion. Which method would you recommend? f) The three-month moving average forecast and forecast error calculations are shown in the table below