forecasting

a. Use the 3-period moving average for making forecasts. - Note: Do not round intermediate calculations. Round final answers to 2 decimal places. b. Use the in-sample forecast errors to compute MSE, MAD, and MAPE. Note: Do not round intermediate calculations. Round final answers to 2 decimal places. c. Make a forecast for period 21. c. Make a forecast for period 21. Note: Do not round intermediate calculations. Round final answer to 2 decimal places. \begin{tabular}{|c|c|c|} \hline 1 & t & yt \\ \hline 2 & 1 & 54 \\ \hline 3 & 2 & 54 \\ \hline 4 & 3 & 39 \\ \hline 5 & 4 & 49 \\ \hline 6 & 5 & 46 \\ \hline 7 & 6 & 55 \\ \hline 8 & 7 & 60 \\ \hline 9 & 8 & 73 \\ \hline 10 & 9 & 81 \\ \hline 11 & 10 & 79 \\ \hline 12 & 11 & 96 \\ \hline 13 & 12 & 95 \\ \hline 14 & 13 & 94 \\ \hline 15 & 14 & 85 \\ \hline 16 & 15 & 81 \\ \hline 17 & 16 & 85 \\ \hline 18 & 17 & 85 \\ \hline 19 & 18 & 70 \\ \hline 20 & 19 & 75 \\ \hline 21 & 20 & 63 \\ \hline \end{tabular}