Question: Please answer. Thank you! 12. Exhibit 9 shows a plot of first differences in the log of monthly lightweight vehicle sales over the same period

Please answer. Thank you!

12. Exhibit 9 shows a plot of first differences in the log of monthly lightweight vehicle sales over the same period as in Problem 11. Has differencing the data made the resulting series, Aln(Sales,) = In(Sales,) - In(Sales,-), covariance stationary? EXHIBIT 9 Change in Natural Log of Lightweight Vehicle Sales A In (Millions of Units) (Annualized) 0.15 0.10 0.05 -0.05 -0.10 -0.15 -0.20 1992 1993 1994 1995 1996 1997 1998 1999 2000 Year

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