20.24 Xr20-24 The quarterly earnings (in $millions) of a largesoft-drink manufacturer have been recorded for the years 2013–2016.These data are listed here. Compute the seasonal indexes given theregression line
y^=61.75+1.18t (t=1,2,...,16)
Year
2013 2014 2015 2016
Quarter
1 52 57 60 66
2Â Â Â 67 75 77 82
3Â Â Â 85 90 94 98
4Â Â 54 61 63 67
Use the seasonal indexes and trend line to forecast thequarterly earnings for the years 2014 and 2015 in Exercise 20.24(above)
