The Last Seven Weeks of Demand at a New Car $\begin{array}{ll}\text { Week}& \text {Sales }\\\hline1 & 25 \\2 & 30 \\3 & 27 \\4 & 31 \\5 & 27 \\6 & 29 \\7 & 30\end{array}$

Essay

The last seven weeks of demand at a new car dealer are shown below. Use a three-period weighted-moving average to determine a forecast for the 8ᵗʰ week using weights of 1, 2, and 3. Calculate the MAD for this forecast. What does the MAD indicate?
$\begin{array}{ll}\text { Week}& \text {Sales }\\\hline1 & 25 \\2 & 30 \\3 & 27 \\4 & 31 \\5 & 27 \\6 & 29 \\7 & 30\end{array}$