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Acceptance sampling procedures by attributes. Specified quality levels in nonconforming items per million
This International Standard specifies, for quality levels expressed as nonconforming items per million items, procedures for estimating the quality level of a single entity (e.g. a lot) and, when the production process is in statistical control, for estimating the process quality level based on evidence from several samples.
Procedures are also specified for using this information when selecting a suitable sampling plan so as to verify that the quality level of a given lot does not exceed a stated limiting quality level (LQL).
For the case where no prior sample data is available, guidance is given for presuming a process quality level in selecting a plan.
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