uarterly demand for vegetables at a Dubai based wholesaler are shown in Table $1.$

a$.$ Forecast quarterly demand for year $5$ using simple exponential smoothing with

$\backslash$alpha $=0\mathrm{.}1$ as well as Holt$$s model with $\backslash$alpha $=0\mathrm{.}1$ and $\backslash$beta $=0\mathrm{.}1.$

b$.$ Evaluate relevant forecasting errors including the standard deviation of

forecast error for both models.

c$.$ Which of the two methods do you prefer? Why?

d$.$ Draw graphs to clearly show the demand and forecast of vegetables for the

periods under consideration.