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3. Fit an AR(4) model to the beersales data. Explain why this is a good or bad idea. Use acf() and pacf() of the residuals

3. Fit an AR(4) model to the beersales data. Explain why this is a good or bad idea. Use acf() and pacf() of the residuals to support the conclusions.

 library(TSA) data(beersales)

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