2 Sigma

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2 Sigma and 3 Sigma deviation for quality control is explained in https://www.brighthubpm.com/change-management/69495-difference-between-2-sigma-vs-3-sigma-control-charts/

See visual from Wikipedia:

https://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule#:~:text=In%20the%20social%20sciences%2C%20a,to%20qualify%20as%20a%20discovery.

Sigma.png

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