(Solution) - Using the data for Problem 16 15 on page 625 that -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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Using the data for Problem 16.15 on page 625 that represent U.S. total computer and software sales (in $mil-lions) from 1992 through 2011 (stored in Computer Sales),
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.