Standard Details
Standard No : SLS ISO 3951 Part 4
Year : 2016
Title : Sampling procedures for inspection by variables Part 4 - Procedures for assessment of declared quality levels
Subject :
Price (LKR) : 6950
Price (USD) : 0
ICS No :
Revision No : 0
Equivalent Standard : ISO 3951-4 : 2011
Scope :

This part of ISO 3951 establishes sampling plans and procedures by variables that can be used to assess whether the quality level of an entity (lot, process, etc.) conforms to a declared value. The sampling plans have been devised so that their operating characteristic curves match those of the corresponding attributes plans in ISO 2859-4 as closely as possible, so that the choice between using sampling by attributes and sampling by variables is not influenced by attempts to increase the chance of accepting an incorrectly declared quality level. In this part of ISO 3951, there is a risk of between 1,4 % and 8,2 % of contradicting a correct declared quality level. The risk is      10 % of failing to contradict an incorrect declared quality level which is related to the limiting quality ratio (see Clause 4). Sampling plans are provided corresponding to three levels of discriminatory ability, and for the cases of unknown and known process standard deviation.

Amendment :
Key Words :