Chapter 18, Problem 12E

a.

To determine

To draw: The graph of the given time series data.

b.

To determine

To calculate: All possible forecasts using a smoothing coefficient $\left(\alpha \right)$ of $0.4$ .

c.

To determine

To calculate: All possible forecasts using a smoothing coefficient $\left(\alpha \right)$ of $0.9$ .

d.

To determine

To calculate: The MAD for forecasts using a smoothing coefficient $\left(\alpha \right)$ of $0.4$ and forecasts using a smoothing coefficient $\left(\alpha \right)$ of $0.9$ .

e.

To determine

To state: The forecast model to be chosen.