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A plastics manufacturing performed a quarterly time series analysis for demands over the last five years (periods 1 through 20). The analysis resulted in the following trend equation and seasonal indexes:
Based on the seasonal indexes, which quarter is expect to have 25% less demand than predicted by the trend line?
This solution is comprised of detailed analysis and step-by-step calculations of Seasonal Forecast Indexes in EXCEL. The solution provides students with a clear perspective of the given problems and the related aspects of forecast analysis.