Question: Based on the forecasting done in the previous problem 1 8 , for the total of three periods, what is the forecasting error measured by

Based on the forecasting done in the previous problem 18, for the total of three periods, what is the forecasting error measured by the following equation?
Equation: ??(yi-hat(y)i)2
Note: the previous question asked to generate a series of prediction using the following equation: hat(yt)=*yt-1+(1-)*hat(y)t-1

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