For the data for Problems 16 through 21, use the arithmetic average of the first six months of data as a baseline to initialize the exponential smoothing.

a. Determine the one-step-ahead exponential smoothing forecasts for August through December, assuming   .20.

b. Compare the accuracy of the forecasts obtained in part

(a) with the one-stepahead six-month moving-average forecasts determined in Problem 20.

c. Comment on the reasons for the result you obtained in part (b).