Standard deviation

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Standard deviation, σ, is a statistical measure of the variability of a set of observations. It is the square root of the variance.


Definitions

According to Financial Management Theory and Practice by Eugene F. Brigham and Michael C. Ehrhardt (13th edition),

Standard deviation, σ. A statistical measure of the variability of a set of observations. It is the square root of the variance.

According to Juran's Quality Handbook by Defeo (7th edition),

Standard deviation. The square root of the variance.

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