Use Exponential Smoothing,with W = 0

question 209

Essay

Use exponential smoothing,with w = 0.4,to forecast the next value of the time series that follows.
$$\begin{array} { | l | l | } \hline \boldsymbol { t } & y _ { \mathbf { t } } \\\hline 1 & 20 \\2 & 16 \\3 & 24 \\4 & 25 \\5 & 22 \\6 & 21 \\\hline\end{array}$$

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