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 The seasonal indexes sum to 4.0. Therefore, the indexes have been _________.

Question

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  The seasonal indexes sum to 4.0. Therefore, the indexes have been _________.

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The Answer of 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  The seasonal indexes sum to 4.0. Therefore, the indexes have been _________.

A Plastics Manufacturer Performed a Quarterly Time Series Analysis for Demands