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Sweetwater Bakery has been using a forecast model for two years to predict quarterly sales and now decide to test it using MAD and a tracking signal. Moreover, they want your help in developing a new forecasting model that takes into account the seasonality in sales and any detectable trend. You believe there is a seasonal factor associated with quarterly sales. Here is quarterly data from the past two years.
Questions:
a) Find the tracking signal. Is the current forecasting routine acceptable?
b) Prepare a forecast for the upcoming year using decomposition.
Please show calculations wherever required.
Period
Forecast
Actual Sales
Quarter 1
250
300
Quarter 5
400
416
Quarter 2
500
540
Quarter 6
800
760
Quarter 3
950
885
Quarter 7
1100
1191
Quarter 4
650
580
Quarter 8
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