Weekly Sales of Copy Paper at Cubicle Suppliers Are in the Table

Essay

Weekly sales of copy paper at Cubicle Suppliers are in the table below. Compute a three-period moving average and a four-period moving average for weeks 5, 6, and 7. Compute MAD for each forecast. Which model is more accurate?
Forecast week 8 with the more accurate method.
$$\begin{array} { c c } \text { Week } & \text { Sales (cases) } \\\hline 2 & 17 \\2 & 21 \\3 & 27 \\4 & 31 \\5 & 19 \\6 & 17 \\7 & 21\end{array}$$