Question: This exercise uses the Tbrate data set in the Ecdat package. In Section 9.16.1, nonseasonal models were fit. Now use auto.arima to find a seasonal

This exercise uses the Tbrate data set in the Ecdat package. In Section 9.16.1, nonseasonal models were fit. Now use auto.arima to find a seasonal model. Which seasonal model is selected by AIC and by BIC? Do you feel that a seasonal model is needed, or is a nonseasonal model sufficient?

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