Refer to Exercise 20.23. Use the seasonal indexes and the trend line to forecast the time series
Question:
In exercise 20.23
Given the following time series, compute the seasonal indexes. The regression equation is
yÌ = 47.7 1.06t (t = 1, 2, . . . , 20)
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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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