Word Count : 358

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To find the coefficient of correlation (denoted as \( r \)), we use the formula: \[ r = \frac{n \sum XY - (\sum X)(\sum Y)}{\sqrt{[n \sum X^2 - (\sum X)^2][n \sum Y^2 - (\sum Y)^2]}} \] Where: - \( X \) is the fertilizer used (in metric tons), - \( Y \) is the productivity (in metric tons), - \( n \) is the number of data points. Let's first organize the given data: | Fertilizer used (X) | Productivity (Y) | \( X^2 \) | \( Y^2 \) __________ ____ ________ ____ _________ _____ _______ _______ __________ _____ ________ __________.
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