Consider the following gasoline sales time series. If needed, round your answers to two-decimal digits. Week Sales (1,000s of gallons) 18 22 10 11 12345672 15 26 18. 17 21 19 22 18 17 21 (a) Show the exponential smoothing forecasts using a = 0.1, and a = 0.2. Exponential Smoothing Week a = 0.1 13 a = 0.2