Lisa Is Comparing Q Uarterly Sales Values Of Last 4 Quarters In Term Of Actual A (1)

Lisa is comparing quarterly sales values of last 4 quarters in term of actual and forecast values. She finds the tracking signals are consistently coming out as large negative numbers (i.e., -7.5, -7.1, -8.8, and -10.5). What should she do with the forecasting model?

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