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Time Periods
the Following Are the Values of a Time t1234yt23252824\begin{array} { | c | c c c c | } \hline \boldsymbol { t } & 1 & 2 & 3 & 4 \\\hline y _ { t } & 23 & 25 & 28 & 24 \\\hline\end{array}

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Time periods
The following are the values of a time series for the first four time periods: t1234yt23252824\begin{array} { | c | c c c c | } \hline \boldsymbol { t } & 1 & 2 & 3 & 4 \\\hline y _ { t } & 23 & 25 & 28 & 24 \\\hline\end{array}
-Suppose that we calculate the four-period moving average of the following time series t123456yt162821152612\begin{array} { | c | c c c c c c | } \hline \boldsymbol { t } & 1 & 2 & 3 & 4 & 5 & 6 \\\hline y _ { t } & 16 & 28 & 21 & 15 & 26 & 12 \\\hline\end{array} What is the centered moving average for period 3?


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