\fa g DATAfile Forecasting Gasoline Sales with Moving Averages. Refer to the gasoline sales time series data in Table 8.1. a. Compute touereek and veweek moving averages for the time series. b. Compute the MSE for the fourweek and veweek moving average forecasts. e. What appears to be the best number of weeks oi past data (three, tour, or ve} to use in the moving average computation? Recall that the MSE for the threeweek moving average is 10.22