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13 cards from this deck
On average, how far each data point deviates from the mean
Mean square deviation
σ=σ2\sigma = \sqrt{\sigma^2}σ=σ2 (SD is square root of variance)
σ2=Σ(x−xˉ)2n\sigma^2 = \frac{\Sigma(x-\bar{x})^2}{n}σ2=nΣ(x−xˉ)2
σ2=x2‾−(xˉ)2\sigma^2 = \overline{x^2} - (\bar{x})^2σ2=x2−(xˉ)2
Mean of all squared data
Mean of all data, then squared
Two data points
All data
Includes outliers
Ignores outliers
Includes extreme outliers
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