Question: 8.1 Consider the problem in Exercise 6.7. We tted a regression model Yt = a + bXt + Nt where Yt denotes sales, Xt denotes

8.1 Consider the problem in Exercise 6.7. We ¯tted a regression model Yt = a + bXt + Nt where Yt denotes sales, Xt denotes advertising and showed that Nt had signi¯cant autocorrelation.

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