Monthly sales for the past nine periods along with the associated forecasts and MAD are shown in the following table. Month Sales Forecast MAD 770 778 786 790 793 790 7 794 8 800 9 801 1 2 3 4 5 6 775 785 790 787 795 4.52 788 3.92 791 3.75 798 3.35 799 3.05 Continue by computing the tracking signal starting in period five using the MAD values shown above.

Monthly sales for the past nine periods along with the associated forecasts and MAD are shown in the following table. Continue by computing the tracking signal starting in period five using the MAD values shown above