please help

\begin{tabular}{|c|c|c|c|} \hline 1 & Week & Sales & \\ \hline 2 & 1 & 5279.2600 & \\ \hline 3 & 2 & 5411.5600 & % \\ \hline 4 & 3 & 5200.8600 & \\ \hline 5 & 4 & 5392.9400 & \\ \hline 6 & 5 & 5283.1800 & \\ \hline 7 & 6 & 5390.0000 & \\ \hline 8 & 7 & 5177.3400 & \\ \hline 9 & 8 & 5074.4400 & \\ \hline 10 & 9 & 4736.3400 & \\ \hline 11 & - 10 & 4912.7400 & \\ \hline 12 & 11 & 4939.2000 & \\ \hline 13 & 12 & 5311.6000 & \\ \hline 14 & 13 & 5011.7200 & \\ \hline 15 & 14 & 4974.4800 & \\ \hline 16 & 15 & 4830.4200 & \\ \hline 17 & 16 & 5126.3800 & \\ \hline 18 & 17 & 4898.0400 & \\ \hline 19 & 18 & 4821.6000 & \\ \hline 20 & 19 & 4874.5200 & \\ \hline 21 & 20 & 4791.2200 & \\ \hline 22 & 21 & 4960.7600 & \\ \hline 23 & 22 & 4632.4600 & \\ \hline 24 & 23 & 5008.7800 & \\ \hline 25 & 24 & 5277.3000 & \\ \hline 26 & 25 & 4935.2800 & \\ \hline 27 & 26 & 4770.6400 & \\ \hline 28 & 27 & 4936.2600 & \\ \hline 29 & 28 & 5246.9200 & \\ \hline 30 & 29 & 4917.6400 & \\ \hline 31 & 30 & 5101.8800 & \\ \hline \end{tabular} a. Use the 3-period moving average to forecast sales for the 31st week. Note: Do not round intermediate calculations. Round final answer to 2 decimal places. b. Use simple exponential smoothing with a=0.3 to forecast sales for the 31 st week. -Note: Do pot round intermediate calculations. Round final answer to 2 decimal places. c-1. Report the performance measures for the techniques in parts a and b. Note: Do not round infermediate calculations. Round final answers to 2 decimal places. c-2. Which is the preferred technique for making the forecast