(a) Compute four-week and five-week moving averages for the time series. Time Series 4-Week Moving 5-Week Moving Week Value Average Average Forecast Forecast 1 18 2 21 3 20 4 24 5 19 20.5 6 16 20.75 20.2 7 20 19.5 20.0 00 8 18 19.75 19.8 9 23 18.25 19.4 10 21 19.25 19.2 11 15 20.5 19.4 12 23 19.5 x 19.8 (b) Compute the MSE for the four-week moving average forecasts. (Round your answer to two decimal places.) 9.36 Compute the MSE for the five-week moving average forecasts. (Round your answer to two decimal places.) 8.09