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Glossary - Z
 

Zlower - The symbol for the Z value for the lower specification limit. It represents the number of standard deviations between the average and the lower specification limit.

Zmin - The minimum of the Z values, either Zupper or Zlower. It is used to calculate the Cpk index in capability analysis.

Zupper - The symbol for the Z value for the upper specification limit. It represents the number of standard deviations between the average and the upper specification limit

z Score - The observed value of the z statistic

z Statistic
- A test statistic whose distribution under the null hypothesis has expected value zero and can be approximated well by the normal curve. Usually, z statistics are constructed by standardizing some other statistic.

z Test
- A hypothesis test based on approximating the probability histogram of the z statistic under the null hypothesis by the normal curve.

Z Value - Used in capability analysis, it is the symbol for the number of standard deviations between the average and a specification limit for a normal distribution.

Zero Acceptance Sampling
- aka C=0

Zero Defects -
A performance standard and method Philip B. Crosby developed; states that if people commit themselves to watching details and avoiding errors, they can move closer to the goal of zero defects. OR the quality concept of zero tolerance for defects.