The Following Sales Data Are Available for 2003-2008 Determine a 4-Year Moving Average Forecast for 2008 and 2009

Short Answer

The following sales data are available for 2003-2008: $$\begin{array} { c c } \text { Year } & \text { Sales } \\\hline 2003 & 7 \\2004 & 12 \\2005 & 14 \\2006 & 20 \\2007 & 16 \\2008 & 25 \\\hline\end{array}$$
Determine a 4-year moving average forecast for 2008 and 2009.