Sxx Command

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Sxx[ <List of Numbers> ]
Calculates the statistic \mathrm{\mathsf{ \sum x^2 - \frac{(\sum x)^2}{n} }}.


Sxx[ <List of Points> ]
Calculates the statistic \mathrm{\mathsf{ \sum x^2 - \frac{(\sum x)^2}{n} }} using the x-coordinates of the given points.

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