Develop an ARIMA model for the emergency road service call volume data. Write Michael a memo summarizing your findings.
An overview of AAA Washington was provided in Case 5-5 when students were asked to prepare a time series decomposition of the emergency road service calls received by the club over five years. The time series decomposition performed in Case 5-5 showed that the pattern Michael DeCoria had observed in emergency road service call volume was probably cyclical in nature. Michael would like to be able to predict the cyclical effect on emergency road service call volume for future years.