Central Tendency

Used in basic data analysis.

A central tendency is rarely perfectly centered. Even if it was, it wouldn’t stay that way. As time goes on a standard deviation can drift over 1.5 sigma over time.

If there was no 1.5 sigma drive a 6 Sigma process would only generate 2 defects per BILLION! As it is, because of this drift, the errors are 3.4 per million.


http://www.six-sigma-material.com/Central-Tendency.html (Measures of central tendency)

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