Refer to the gasoline sales time series data in the given table. a. Compute four-week and five-week moving averages for the time series. Round your answers to two decimal places a. Compute four-week and five-week moving averages for the time series. Round your answers to two decimal places. b. Compute the MSE for the four-week and five-week moving average forecasts. Round your intermediate calculations and final answers to two decimal ploces. b. Compute the MSE for the four-week and five-week moving average forecasts. Round your intermediate calculations and final answers to two decimal places: MSE for four-week moving average = MSE for five-week moving average = c. What appears to be the best number of weeks of past data (three, four, or five) to use in the moving average computation? Recall that MSE for the three week moving average is 13.42