Question: 2. Is the model suggested in Question 1 adequate? Discuss with reference to residual plots, residual autocorrelations, and the Ljung-Box chi-square statistics. If the model

2. Is the model suggested in Question 1 adequate? Discuss with reference to residual plots, residual autocorrelations, and the Ljung-Box chi-square statistics. If the model is not adequate, modify ARIMA10, 1, 0210, 1, 1212 and refit the initial model until you feel you have achieved a satisfactory model.

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