Question: Answer this question based on time series model: y , = ( + 8 , + 6 8 , - + 0 2 8 -

Answer this question based on time series model: y,=(+8,+68,-+028-2,
s, ~ white noise (O,o'). The 3-step-ahead optimal forecast (under quadratic loss) basedon information available up to time T is

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