• A manager uses a trend equation plus quarterly relatives to predict demand. Quarter relatives are SR1 = 0.9, SR2 = 0.95, SR3 = 1.05, and SR4 = 1.1. The trend equation is: Ft = 9 + 4t. Over the past nine quarters, demand has been as follows: 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.) Period, t: Demand: Forecast MAD Tracking Signal 1 14 13 ____ ____ 2 18 17 ____ ____ 3 20 21 ____ ____ 4 22 25 ____ ____ 5 28 29 ____ ____ 6 30 33 ____ ____ 7 36 37 ____ ____ 8 42 41 ____ ____ 9 45 45 ____ ____