The data file Fargo Electronics Earnings shows quarterly sales of a corporation over a period of 6 years. a. Draw a time plot of this series and discuss its features. b. Use the seasonal-index method...

The data file
Fargo Electronics Earnings
shows quarterly sales of a corporation over a period of 6 years.

a. Draw a time plot of this series and discuss its features.

b. Use the seasonal-index method to seasonally adjust this series. Graph the seasonally adjusted series and discuss its features.