b. Compute the MAD for the forecast for above data 12. The following are four years of quarterly data reflecting demands (in 1.000's) for the Getaway Titanium IV Desktop PC bundled with the Windows OP software. 2005 OTR DEMAND 131 2003 1 2 3 QTR DEMAND 56 1 70 2 76 3 97 4 150 152 184 2004 2006 1 2 3 76 1 99 2 120 3 164 4 138 171 200 265 (a) Plot the data. What components (trend, seasonal, and cyclical appear to be present? (b) Using the moving average method. (c) Apply Simple Exponential Smoothing method to the above data and estimate demands for each quarter of 2007 assuming the forecast is made at the end of 2006. Use alpha= .3, and Beta = 7 (d) Which of the above two methods is best based upon the MAD? o