Refer to the gasoline sales time series data in the given table. Week 1 2 3 4 5 6 7 8 9 10 11 12 Sales (1000s of gallons) 17 21 19 23 19 15 20 18 23 20 15 22 a. Compute four-week and five-week moving averages for the time series. If required, round your answers to two decimal place 4 Period 5 Period

a. Compute four-week and five-week moving averages for the time series. If required, round your answers to two decimal pla . Compute four-week and five-week moving averages for the time series. If required, round your answers to two decimal places. b. Compute the MSE for the four-week and five-week moving average forecasts. If required, round your intermediate calculations to four decimal places and round your final answers to three decimal places. MSE for four-week moving average =