1. For this data create quarterly forecasts using exponential forecasting with a=0.25 and moving averages with n=2.
2. Based on MPAD which methos is better for forecasting?
3. Using the better method, update forecasting using seasonal indexing.

\begin{tabular}{|r|r|r|r|} Year & Quarter & Sales & \\ \hline 1 & 1 & 1690 & \\ \hline 1 & 2 & 940 & \\ \hline 1 & 3 & 2625 & \\ \hline 1 & 4 & 2500 & \\ \hline 2 & 1 & 1800 & \\ \hline 2 & 2 & 900 & \\ \hline 2 & 3 & 2900 & \\ \hline 2 & 4 & 2360 & \\ \hline 3 & 1 & 1850 & \\ \hline 3 & 2 & 1100 & \\ \hline 3 & 3 & 2930 & \\ \hline 3 & 4 & 2615 & \\ \hline \end{tabular}