TS ISO 39511
Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation)
This International Standard specifies sequential sampling plans and procedures for inspection by variables of discrete items.
The plans are indexed in terms of producer’s risk point and the consumer’s risk point. Therefore, they are suitable not only for the purposes of acceptance sampling, but for the more general purpose of the testing of simple statistical hypotheses for proportions.
The purpose of this International Standard is to provide procedures for the sequential assessment of inspection results that may be used to induce the supplier to supply lots of a quality having a high probability of acceptance. At the same time, the consumer is protected by a prescribed upper limit to the probability of accepting a lot (or process) of poor quality.
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About This Item
TS ISO 39511 addresses sequential sampling plans for inspection by variables, using percent nonconforming and assuming a known standard deviation. It provides a statistical framework for evaluating measured characteristics of individual discrete items in sequence so that decisions can be made about a lot or process quality as results accumulate.
How sequential variable inspection works
In sequential inspection, the decision is not fixed to a preset sample size; instead, inspection continues only until the accumulated evidence is sufficient. Inspection by variables uses actual measurement values rather than simple conforming/nonconforming counts, which can make quality assessment more informative. The known-standard-deviation assumption allows the plans to be formulated when process variation is already reliably understood.
What this standard is meant to support
- The plans are indexed in terms of producer’s risk point and consumer’s risk point.
- They are suitable for acceptance sampling and also for testing simple statistical hypotheses.
- Their purpose is to encourage high-probability acceptance of good lots while limiting acceptance of poor-quality lots.
- The scope applies to inspection of discrete items using measurable characteristics.
- Publication Date: 15.02.2021
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 03.120.30 İstatistiksel Metotların Uygulanması
- Pages: 45
- Source Standard: ISO 39511:2018
- International Equivalents: ISO 39511-EQV
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