Plot the tracking signals for each forecast and evaluate the movement of the signal. Assume that the analyst would flag forecasts with signals that are greater than $3$ or less than $-3.$ Which product$($s$)$ should be reviewed immediately for potential forecasting issues? Discuss the tracking signals for each and what the implications are.

$17.$ Here are the actual tabulated demands for an item for a nine$-$month period $($January through September$).$ Your supervisor wants to test two forecasting methods to see which method w better over this period.

$\backslash$table$[[$MONTH$,],[$January$,$ACTUAL$],[$February$,110],[$March$,130],[$April$,150],[$May$,160],[$June$,170],[$July$,180],[$August$,140],[$September$,130]]$

a$.$ Forecast April through September using a three$-$month moving average.

b$.$ Use simple exponential smoothing with an alpha of $0\mathrm{.}3$ to estimate April through September, using the average of January through March as the initial forecast for April.

c$.$ Use MAD to decide which method produced the better forecast over the six$-$month period.