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.

ao= 4.50 al= 1.80 a2-0.80 a3=0.24 5,1-0.50 Sa2-0.30 S",-0.10

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