For Question 10, A company is examining their monthly time series and wish to obtain seasonal monthly forecasts for year 4. The company collected the demand data and presented the data in the table. Month 1 2 3 4 5 6 7 8 9 10 11 12 Year 1 299 348 389 493 613 663 545 515 477 315 310 304 Year 2 420 462 487 610 736 780 654 640 592 440 435 422 Year 3 532 573 621 733 847 888 778 741 701 538 539 540 From the demand data, the company produced the data plots to determine components. The demand time series plot illustrates a linear trend component. The demand stacked plot illustrates a seasonal component within each year. Demand 1000 800 Demand Time Series Plot Demand Stacked Plot 1000 800 600 400 Demand 600 400 200 200 -Year 1 Year 2 Year 3 0 0 12 24 36 0 6 Month Month 12