Sxy Command

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Sxy( <List of Points> )
Calculates the statistic \sum xy - \frac{(\sum x) (\sum y)}{n} using the coordinates of the given points.


Sxy( <List of Numbers>, <List of Numbers> )
Calculates the statistic \sum xy - \frac{(\sum x) (\sum y)}{n}, where x are the values in the first list, and y are the values in the second given list.
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