b$)$ The MAD for this model $=$ thousand $($round your response to two decimal places$).$ c$)$ Compute the Cumulative Forecast Errors, cumulative MAD in thousands, and tracking signals $($round your responses to two decimal places$).$ Are the tracking signals within acceptable limits$?$ The control limits for the tracking signal are set at $\backslash$pm $5$ MADs. The tracking signals acceptable limits$.$