P-5) (30 Pts.) One of the spare parts for B category of automobiles has the following demand history over a 24 periods (months): a. Make a "time series plot of the data" and verify that it is seasonal. Why do you think that the seasonality is presentot present in these data? (5pts) b. Using the data from Years 1 and 8, determine initial values of the intercept, slope, and seasonal factors for Winters's method. (5 Pts.) c. Using =0.2 and =0.3. and =0.4 update the estimates of the series, the slope, and the seasonal factors. (10 Pts.) d. What are the forecasts made at the end of the sixth period for the next three periods (7th,8th and 9th periods)? (10 Pts.) P-5) (30 Pts.) One of the spare parts for B category of automobiles has the following demand history over a 24 periods (months): a. Make a "time series plot of the data" and verify that it is seasonal. Why do you think that the seasonality is presentot present in these data? (5pts) b. Using the data from Years 1 and 8, determine initial values of the intercept, slope, and seasonal factors for Winters's method. (5 Pts.) c. Using =0.2 and =0.3. and =0.4 update the estimates of the series, the slope, and the seasonal factors. (10 Pts.) d. What are the forecasts made at the end of the sixth period for the next three periods (7th,8th and 9th periods)? (10 Pts.)