348. Sigma is a statistical unit of measure that reflects process capability. The sigma
scale of measure is perfectly correlated to such characteristics as defects-per-
unit, parts-per-million defective, and the probability of a failure/error.
2 308,537
3 66,807
4 6,210
5 233
6 3.4
PPM
Process
Capability
Defects per
Million Opp.
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