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The values of variables $x$ and $y$ are listed in the following table and visualized in the next graph. Calculate the correlation coefficient of $x$ and $y$ and round it to four decimal places. $$\begin{array}{|cccccc|}\hline x& 5& 6& 7& 9& 11\\ y& 3& 2& 4& 6& 8\\ \hline\end{array}$$