Consider the Following to Answer the Question(s) Below

Multiple Choice

Consider the following to answer the question(s) below:
A third-order autoregressive model, AR (3) was fit to monthly closing stock prices, adjusted for dividends, of Boeing Corporation from January 2006 through August 2008 (closing price on the first trading day of the month) . The results are as follows:

-Which of the following is true about index numbers? Index numbers are

A) used to make a relative comparison of different time periods.
B) used to measure the trend component.
C) used to measure the seasonal component.
D) used to measure the cyclical component.
E) used to measure the irregular component.