Calculate Karl Pearson's coefficient of correlation between \( x \)...

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Calculate Karl Pearson's coefficient of correlation between \( x \) and \( y \) for the following data and interpret the result :
\[
(1,6),(2,5),(3,7),(4,9),(5,8),(6,10),(7,11),(8,13),(9,12) \text {. }
\]
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