# Using the data for Problem 16.15 on page 625 that represent U.S. total computer and software sales

## Question:

a. Fit a third-order autoregressive model to the total sales and test for the significance of the third-order autoregressive parameter. (Use a = 0.05.)

b. If necessary, fit a second-order autoregressive model to the total sales and test for the significance of the second-order autoregressive parameter. (Use a = 0.05.)

c. If necessary, fit a first-order autoregressive model to the total sales and test for the significance of the first-order autoregressive parameter. (Use a = 0.05.)

d. If appropriate, forecast the total sales in 2012.

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**Related Book For**

## Statistics For Managers Using Microsoft Excel

**ISBN:** 772

7th Edition

**Authors:** David M. Levine, David F. Stephan, Kathryn A. Szabat