Sxy Command

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Sxy[List of Numbers, List of Numbers]
Calculates the statistic Σ(xy) - Σ(x) * Σ(y)/n.
Sxy[List of Points]
Calculates the statistic Σ(xy) - Σ(x) * Σ(y)/n using the x- and y-coordinates of the given points.
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