Question: Repeat Exercise 20.15, using exponential smoothing with w = .8. In exercise 20.15 The following quarterly sales of a department store chain were recorded for

Repeat Exercise 20.15, using exponential smoothing with w = .8.

In exercise 20.15

The following quarterly sales of a department store chain were recorded for the years 2013€“2016.

Year 2014 2013 2015 2016 Quarter 18 33 25 41 22 20 36 33 3 27 38 44 52 29 4 31 26 45


a. Calculate the four-quarter centered moving averages.

b. Graph the time series and the moving averages.

Year 2014 2013 2015 2016 Quarter 18 33 25 41 22 20 36 33 3 27 38 44 52 29 4 31 26 45

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