Question: Using the data for Problem 16.17 on page 626 concerning the number of passenger cars produced in the United States from 1999 to 2011 (stored

Using the data for Problem 16.17 on page 626 concerning the number of passenger cars produced in the United States from 1999 to 2011 (stored in Car Production).
a. Fit a third-order autoregressive model to the number of passenger cars produced in the United States 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 number of passenger cars produced in the United States 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 number of passenger cars produced in the United States and test for the significance of the first-order autoregressive parameter. (Use a - 0.05.)
d. forecast the U.S. car production for 2012.

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