2. The sales history for an item is: Quarter 1 Quarter 20X3 497 20X4 631...
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2. The sales history for an item is: Quarter 1 Quarter 20X3 497 20X4 631 20X5 709 2 454 654 715 3 624 921 1012 4 764 1017 1242 Calculate the 4-period centered moving averages for the above time series and estimate the initial seasonal indexes for Winter's model. Renumber the four quarters of 20X5 in reverse order as 0,-1,-2 and -3. Use notation when you write/record your final answers. 2. The sales history for an item is: Quarter 1 Quarter 20X3 497 20X4 631 20X5 709 2 454 654 715 3 624 921 1012 4 764 1017 1242 Calculate the 4-period centered moving averages for the above time series and estimate the initial seasonal indexes for Winter's model. Renumber the four quarters of 20X5 in reverse order as 0,-1,-2 and -3. Use notation when you write/record your final answers
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