(a) Show the exponential smoothing forecasts using a=0.1, and a=0.2. (b) Applying the MSE measure of forecast accuracy, would you prefer a smoothing constant of a=0.1 or a=0.2 for the gasoline sales time series? An smoothing constant provides the more accurate forecast, with an overall MSE of (c) Are the results the same if you apply MAE as the measure of accuracy? An smoothing constant provides the more accurate forecast, with an overall MAE of (d) What are the results if MAPE is used? An smoothing constant provides the more accurate forecast, with an overall MAPE of