1. Perform a time series decomposition on the AAA emergency road service calls data.
2. Write a memo to Mr. DeCoria summarizing the important insights into changes in emergency road service call volume that you discovered from your time series decomposition analysis.
Emergency Road Call Volume by Month for AAA Washington

In 1993, AAA Washington was one of the two regional automobile clubs affiliated with the American Automobile Association (AAA or Triple A) operating in Washington State. At that time, 69% of all people belonging to automobile clubs were members of the American Automobile Association, making it the largest automobile club in North America. AAA was a national association that serviced its individual members through a federation of approximately 150 regional clubs that chose to be affiliated with the national association.

Year Year 1988 991 January 1989 1992 January 22,367 1990 September 20.251 1993 January 26,127