Question 1 The data in the following table show the daily sales of paperback books and hardcover books at the same store. The task is to forecast the next four days' sales for paperb 'es and hardcover books. (a) Using four-month moving average method compute the measures of forecasting accuracy over the test periods 11-30. (b) Use single exponential smoothing and compute the measures of forecasting accuracy over the test periods 11-30 for =0.2 and =0.4 (c) Repeat using the method of linear exponential smoothing (Holt's method) with =0.4 and =0.5 (d) Repeat using the method of linear exponential smoothing (Holt-Winter's method) with =0.445,= 0.501 and =0.00 (additive and multiplicative) (e) Compare the error statistics and discuss the merits of the two forecasting methods for these data sets. (f) Compare the forecasts for the two methods and discuss their relative merits