Sampling procedures for inspection by variables – Part 4: Procedures for assessment of declared quality levels<\/p>\n","protected":false},"excerpt":{"rendered":"
This part of ISO 3951 establishes sampling plans and procedures by variables that can be used to assess
\nwhether the quality level of an entity (lot, process, etc.) conforms to a declared value. The sampling plans
\nhave been devised so that their operating characteristic curves match those of the corresponding attributes
\nplans in ISO 2859-4 as closely as possible, so that the choice between using sampling by attributes and
\nsampling by variables is not influenced by attempts to increase the chance of accepting an incorrectly
\ndeclared quality level. In this part of ISO 3951, there is a risk of between 1,4 % and 8,2 % of contradicting a
\ncorrect declared quality level. The risk is 10 % of failing to contradict an incorrect declared quality level which
\nis related to the limiting quality ratio (see Clause 4). Sampling plans are provided corresponding to three levels
\nof discriminatory ability, and for the cases of unknown and known process standard deviation.
\nIn contrast to the procedures in the other parts of ISO 3951, the procedures in this part of ISO 3951 are not
\napplicable to acceptance assessment of lots. Generally, the balancing of the risks of reaching incorrect
\nconclusions in assessment procedures will differ from the balancing in the procedures for acceptance
\nsampling.
\nThis part of ISO 3951 may be used for various forms of quality inspection in situations where objective
\nevidence of conformity to some declared quality level is to be provided by means of inspection of a sample.
\nThe procedures are applicable to entities such as lots, process output, etc. that allow random samples of
\nindividual items to be taken from the entity.
\nThe sampling plans provided in this part of ISO 3951 are applicable, but not limited, to inspection of a variety
\nof products such as
\n? end items,
\n? components and raw materials,
\n? operations,
\n? materials in process,
\n? supplies in storage,
\n? maintenance operations,
\n? data or records, and
\n? administrative procedures.
\nThe procedures are intended to be used when the quality characteristics are measurable variables that are
\nindependent and normally distributed, and where the quantity of interest is the fraction of items that are
\nnonconforming.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":""},"product_brand":[],"product_cat":[175],"product_tag":[],"class_list":["post-166924","product","type-product","status-publish","product_cat-tse","first","instock","purchasable","product-type-simple","entry","content-bg","loop-entry"],"taxonomy_info":{"product_cat":[{"value":175,"label":"TSE"}]},"featured_image_src_large":false,"author_info":[],"comment_info":"","_links":{"self":[{"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/product\/166924","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/media?parent=166924"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/product_brand?post=166924"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/product_cat?post=166924"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/onlinestandart.com\/en\/wp-json\/wp\/v2\/product_tag?post=166924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}