1. Write Dorothy a memo that explains the Box-Jenkins methodology.
2. Develop an ARIMA model using the Box-Jenkins methodology, and forecast the monthly number of new clients for the rest of 1993.
3. Write Dorothy a second memo that summarizes the results of this analysis.
The Consumer Credit Counseling (CCC) operation was described in Cases 1-2 and 3-3.
The executive director, Marv Harnishfeger, concluded that the most important variable that CCC needed to forecast was the number of new clients that would be seen for the rest of 1993. Marv provided Dorothy Mercer with monthly data for the number of new clients seen by CCC for the period from January 1985 through March 1993.