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A Plastics Manufacturer Performed a Quarterly Time Series Analysis for Demands

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A plastics manufacturer 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:
Ŷ = 920.0 + 22.6t A plastics manufacturer 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: Ŷ = 920.0 + 22.6t Ŷ Based on the seasonal indexes, which quarter is expect to have 25% less demand than predicted by the trend line? Ŷ
Based on the seasonal indexes, which quarter is expect to have 25% less demand than predicted by the trend line?

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