Given the following time series, compute the seasonal indexes. The regression equation is yÌ = 47.7 1.06t

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Given the following time series, compute the seasonal indexes. The regression equation is

yÌ‚ = 47.7 ˆ’ 1.06t (t = 1, 2, . . . , 20)

 Year Quarter 55 44 46 39 2 4 3 41 38 37 43 39 39 35 36 32 30 25 50 25 24 22 2 3 4 2.


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