A manager uses a trend equation plus quarterly relatives to predict demand Quarter relatives are SR1 =0.9, SR2=0.95, SR3-105. and SRA = 11. The trend equation is. F = 12 + 4+ Over the past nine quarters, demand has been as follows: 1 2 3 4 5 6 7 8 9 Period, t: Demand: 15 20 25 28 31 33 39 41 47 Compute the MAD and tracking signal for each period. (Negative values should be indicated by a minus sign. Round your intermediate calculations and final answers to 3 decimal places.) MAD Tracking signal Period, t Demand 1 15 2 20 3 25 4 28 5 31 6 33 7 39 41 9 47