Question: on page 674 that represent U.S. total computer and software sales (in $millions) from 1992 through 2012 (stored in ComputerSales ), a. fit a third-order

on page 674 that represent U.S. total computer and software sales (in $millions) from 1992 through 2012 (stored in ComputerSales ),

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 2013.

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