Sales for the past 12 months at Computer Success are given here. Month Sales (S) January 3,000 February 3,400 March 3,700 April 4,100 May 4,700 June 5,700 Month Sales (S) July 6,300 August 7,200 September 6,400 October 4,600 November 4,200 December 3,900 (a) Use a three-month moving average to forecast the sales for the months May through December. (b) Use a four-month moving average to forecast the sales for the months May through December. (e) 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?