Suppose these data show the number of gallons of gasoline sold by a gasoline distributor In Bennington, Vermont, over the past 12 weeks. Week Sales (1,000s of gallons) 18 21 19 24 18 6 17 7 20 8 18 22 10 21 11 16 12 22 (a) Compute four-week and five-week moving averages for the time series. 4-Week 5-Week Week Time Series Moving Moving Value Average Average Forecast Forecast 18 21 19 24 18 17 20 8 18 9 22 10 21 11 16 12 22 (b) Compute the MSE for the four-week moving average forecasts. (Round your answer to two decimal places.) Compute the MSE for the five-week moving average forecasts. (Round your answer to two decimal places.) (c) What appears to be the best number of Three weeks appears to be be data (three, four, or five) to use in the moving average computation? MSE for the three-week moving average is 9.21. O Three w allest MSE. ks appear O Four we vides the largest MSE. Five week mallest MSE. Nor ge provides the smallest MSE. same MSE