4.Probability and Defects

One of the most critical conceptual relationships to understand in learning the Six Sigma methodology is the idea of probability of defects and the yield of a process. The following production results were noted:

•A total of 1,000 parts were produced.
•22 parts were greater than the Upper Spec Limit.
•31 parts were less than the Lower Spec Limit.
•Therefore 22+31=53 parts were rejected._