grow until year $8,$ after which it is expected to plateau. Julie must select the appropriate forecasting

method and estimate the likely forecast error. Which method should she choose? Why? Using the

method selected, forecast demand for years $6$ to $8.($Hint: Given the clear seasonal pattern in the

data, the forecast is made using the static forecasting method $($with trend and seasonality$)$ and

Winter's model $($both outlined in Chapter $7).$