The Last Four Weekly Values of Sales Were 80, 100

The last four weekly values of sales were 80, 100, 105, and 90 units. The last four forecasts (for the same four weeks) were 60, 80, 95, and 75 units. Calculate MAD, MSE, and MAPE for these four weeks.
$$\begin{array} { | c | c | c | c | c | } \hline \text { Sales } & \text { Forecast } & \text { Error } & \text { Error squared } & \text { Pct. error } \\\hline 80 & 60 & 20 & 400 & .25 \\\hline 100 & 80 & 20 & 400 & .20 \\\hline 105 & 95 & 10 & 100 & .095 \\\hline 90 & 75 & 15 & 225 & .167 \\\hline\end{array}$$

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MAD = 65/4 = 16.25; ...

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