DATAfile: Gasoline These data show the number of gallons of gasoline sold by a gasoline distributor in Bennington, Vermont, over the past 12 weeks. Sales (1,000s Week of gallons) 1 17 2 21 3 19 4 23 5 18 6 16 7 20 8 co 18 9 22 10 10 20 11 15 12 22 (a) Compute four-week and five-week moving averages for the time series. 4-Week 5-Week Time Series Week Moving Moving Value Average Average Forecast Forecast 1 17 2 21 3 19 4 23