Question: Given the autocorrelations in Figure 9-39 and the partial autocorrelations in Figure 9-40, what regular (nonseasonal) terms might John include in an ARIMA model for

Given the autocorrelations in Figure 9-39 and the partial autocorrelations in Figure 9-40, what regular (nonseasonal) terms might John include in an ARIMA model for Mr. Tux sales? What seasonal terms might be included in the model?

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