Problem 15-09 With the gasoline time series data from the given table, show the exponential smoothing forecasts using a = 0.1. Week Sales (1000s of gallons) 1 17 2 21 3 19 4 23 5 18 6 16 7 20 8 18 9 22 10 20 11 15 12 22 a. 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? Do not round your interim computations and round your final answers to two decimal places. a = 0.1 a = 0.2 MSE Prefer: b. Are the results the same if you apply MAE as the measure of accuracy? Do not round your interim computations and round your final answers to two decimal places. al = 0.1 a = 0.2 MAE Prefer: C. What are the results if MAPE is used? Do not round your interim computations and round your final answers to two decimal places. a = 0.1 a = 0.2 MAPE % % Prefer