74  Spread

Metric Equation Description Example
Sample Variance (\(s^{2}\)) \(\frac{\sum_{i=1}^{n}(x_{i}-\bar{x})^{2}}{n-1}\)
Sample Standard Deviation (\(s\)) \(\sqrt{s^{2}}\)
Range \(Q_4-Q_0\) The maximum value minus the minimum value (Q4-Q0).
Inter-quartile-Range (IQR) \(Q_3-Q_1\) The middle 50% of the sample.