For the data given in Problem 2 (and provided again in the table below), build an exponential smoothing forecast using Using the mean absolute deviation, would you prefer a smoothing constant of a = 0.1 or a = 0.20 ? Show your work in the table below, then explain your choice in the area below the table. Sales ESF with (1000's of gals) a = 0.1 Absolute Deviation ESF with a = 0.2 Absolute Deviation a = 0.2 Week a = 0.1 17 21 19 23 18 16 20 18 22 20 15 22 MAD