Question: Department Store Sales. The time plot in Figure 18.7 describes actual quarterly sales for a department store over a 6-year period (data are available in

Department Store Sales. The time plot in Figure 18.7 describes actual quarterly sales for a department store over a 6-year period (data are available in DepartmentStoreSales.csv, data courtesy of Chris Albright).

a. Which of the following methods would not be suitable for forecasting this series?

• Moving average of raw series

• Moving average of deseasonalized series

• Simple exponential smoothing of the raw series

• Double exponential smoothing of the raw series

• Holt-Winter’s exponential smoothing of the raw series

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