Question: The data in Table P-16 show seasonally adjusted quarterly sales for Dickson Corporation and for the entire industry for 20 quarters. a. Fit a linear

The data in Table P-16 show seasonally adjusted quarterly sales for Dickson Corporation and for the entire industry for 20 quarters.

a. Fit a linear regression model, obtain the residuals, and plot the residuals against time. What do you find?

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