Question: A third-order autoregressive model is fitted to an annual time series with 17 values and has the following estimated parameters and standard errors: At the

A third-order autoregressive model is fitted to an annual time series with 17 values and has the following estimated parameters and standard errors:
A third-order autoregressive model is fitted to an annual time
At the 0.05 level of significance, test the appropriateness of the fitted model.

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