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1) The document provides observations from a time series model fitted by zt - 1.1at-1 + 0.28at-2 from periods z91 to z100. 2) It asks to generate 12-period ahead forecasts from period z100 and calculate 80% probability limits. The forecasts are all equal to 168.83 and probability limits are provided from periods z101 to z112. 3) It also asks to generate quarterly sales forecasts for the next 4 quarters using the same model and data, and calculate 80% probability limits for these forecasts. 4) Given a n
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