4. [This may be challenging for some; I am not asking everyone to nail this perfectly, but please do give it some thought and participate with your group as you ca n]. One of the organizers has questioned the wisdom of giving equal weighting to all five past years when calculating the average seasonal factors (as done in Q2), and has proposed that only the three most recent years should be used, with the index from the most recent year being weighted by 0.5 and the other two by 0.25. Briefly discuss your thoughts on this suggestion. (You may also wish to calculate and compare average seasonal factors under each method - using all five years, or only using the most recent three years and weighting them as proposed}