fter using your forecasting model for six months, you decide to test it using a tracking signal. Here are the forecast and actual demands for the six

$-$

month period:

PERIOD FORECAST ACTUAL

May

$4$

$4$

$5$

$4$

$5$

$5$

June

$4$

$9$

$5$

$5$

$5$

$0$

July

$5$

$4$

$5$

$3$

$5$

$5$

August

$5$

$8$

$0$

$4$

$7$

$0$

September

$6$

$1$

$5$

$6$

$6$

$5$

October

$7$

$2$

$0$

$5$

$8$

$5$

Find the tracking signal.

Note: Negative values should be indicated by a minus sign. Round your answers to

$2$

$$decimal places.