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=8+4t Over the past nine quarters, demand has been as follows: Click here for the Excel Data File 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.)