Question: For a certain product it was found that annual sales volume could be well described by a third-order autoregressive model. The estimated model obtained was

For a certain product it was found that annual sales volume could be well described by a third-order autoregressive model. The estimated model obtained was as follows:
xt = 202 + 1.10xt-1 – 0.48xt-2 + 0.17xt-3 + εt
For 1993, 1994, and 1995, sales were 867, 923, and 951, respectively. Calculate sales forecasts for the years 1996 through 1998.

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