2.2 Use the Dow Jones index (data set dowjones) to do the following:

(a) Produce a time plot of the series.

(b) Produce forecasts using the drift method and plot them.

(c) Show that the graphed forecasts are identical to extending the line drawn between the first and last observations.

(d) Try some of the other benchmark functions to forecast the same data set. Which do you think is best? Why?