Use the seasonal indexes and trend line to forecast the quarterly earnings for the years 2014 and

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Use the seasonal indexes and trend line to forecast the quarterly earnings for the years 2014 and 2015 in Exercise 20.24.

In exercise 20.24

The quarterly earnings (in $millions) of a large soft-drink manufacturer have been recorded for the years 2013€“2016. These data are listed here. Compute the seasonal indexes given the regression line

ŷ = 61.75 + 1.18t (t = 1, 2, . . . , 16)

Quarter 2013 2014 2015 2016 57 52 60 66 82 2 3 4 67 85 77 75 90 94 98 61 54 63 67

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