Ten weeks of data on the Commodity Futures Index are 7.35, 7.40, 7.55, 7.56, 7.60, 7.52, 7.52, 7.70, 7.62, and 7.55.

a. Compute the exponential smoothing values for α = 0.2.

b. Compute the exponential smoothing values for α = 0.3.

c. Which exponential smoothing model provides the better forecasts? Forecast week 11.