Question: Using the yearly amount of solar power generated by utilities (in millions of kWh) in the United States from 2002 through 2011 data for Problem

Using the yearly amount of solar power generated by utilities (in millions of kWh) in the United States from 2002 through 2011 data for Problem 16.16 on page 626 (stored in Solar Power),
a. Fit a third-order autoregressive model to the amount of solar power installed 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 amount of solar power installed 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 amount of solar power installed and test for the significance of the first-order autoregressive parameter. (Use a = 0.05.)
d. forecast the yearly amount of solar power generated by utilities (in millions of kWh) in the United States in 2012 and 2013.

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