Recall that Figure 13 26(a) gives n 16 weekly values of Pages ' Bookstore sales (y), Pages ' advertising expenditure (x1), and competitor 's advertising expenditure (x2) Use MINITAB or Excel, to fit the model y 0 1x1 2x2 and plot the model 's residuals versus time Does the residual plot indicate that using x2 in the model has removed the autocorrelation that is apparent in Figure 13 26(b)

Question: Recall that Figure 13.26(a) gives n = 16 weekly values of Pages' Bookstore sales (y), Pages' advertising expenditure (x1), and competitor's advertising expenditure (x2). Use

Recall that Figure 13.26(a) gives n = 16 weekly values of Pages' Bookstore sales (y), Pages' advertising expenditure (x1), and competitor's advertising expenditure (x2). Use MINITAB or Excel, to fit the model
y = β0 + β1x1 + β2x2 + ε
and plot the model's residuals versus time. Does the residual plot indicate that using x2 in the model has removed the autocorrelation that is apparent in Figure 13.26(b)?

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