ISO 8423:1991/Cor 1:1993
(Corrigendum)Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation) — Technical Corrigendum 1
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- 01-Sep-1993
- 01-Sep-1993
- 03.120.30
- ISO/TC 69/SC 5
Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation) — Technical Corrigendum 1
Amends values in table 1 and subclause C.2.3 and equations in subclauses 3.2.2.1 and 3.2.3.1.
Plans d'échantillonnage progressif pour le contrôle par mesures des pourcentages de non conformes (écart-type connu) — Rectificatif technique 1
Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation) - Technical corrigendum 1
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation) - Technical corrigendum 1ISO 8423:1991/Cor 1:199303.120.30Application of statistical methodsICS:Ta slovenski standard je istoveten z:ISO 8423:1991/Cor 1:1993SIST ISO 8423:1996/C1:1996en01-september-1996SIST ISO 8423:1996/C1:1996SLOVENSKI
STANDARD
SIST ISO 8423:1996/C1:1996
INTERNATIONAL STANDARD ISO 8423:1991 --/u/llx\- TECHNICAL CORRIGENDUM 1 +Iso; ÖLS Published 1993-09-01 INTERNATIONAL OAGANUATION FOR STANDARDIZATION. ME~YHAPO~HAR OPrAHl43ALlHR n0 CTAH~APTH3AL&lH. ORGANlSAllON INlERNATlONALE DE NORMALISATlON Sequential sampling Plans for ~inspection by variables for percent nonconforming (known Standard deviation) TECHNICAL CORRIGENDUM 1 Plans dkhantillonnage progressif pour Ie contrGle par mesures des pourcentages non conformes (Ecart-type connu) RECTIFlCATlF TECHN
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This document specifies single sampling plans for lot-by-lot inspection under the following conditions: a) where the inspection procedure is applied to a continuing series of lots of discrete products, all supplied by one producer using one production process; b) where only a single quality characteristic, x, of these products is taken into consideration, which is measurable on a continuous scale; c) where production is under statistical control and the quality characteristic, x, is distributed according to a normal distribution or a close approximation to the normal distribution; d) where a contract or standard defines a lower specification limit, L, an upper specification limit, U, or both. An item is qualified as conforming if its measured quality characteristic, x, satisfies as appropriate one of the following inequalities: 1) x ≥ L (i.e. the lower specification limit is not violated); 2) x ≤ U (i.e. the upper specification limit is not violated); 3) x ≥ L and x ≤ U (i.e. neither the lower nor the upper specification limit is violated). Inequalities 1) and 2) are cases with a single specification limit, and 3) is a case with double specification limits. Where double specification limits apply, it is assumed in this document that conformity to both specification limits is equally important to the integrity of the product. In such cases, it is appropriate to apply a single AQL to the combined percentage of a product outside the two specification limits. This is referred to as combined control.
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This document establishes single sampling plans for conformance testing, i.e., for assessing whether the quality level of a relevant audit population (lot, process, inventory, file etc) conforms to a declared value. Sampling plans are provided corresponding to four levels of discriminatory ability. The limiting quality ratio (LQR) (see Clause 4) of each sampling plan is given for reference. For levels I-III, the sampling plans have been devised so as to obtain a risk no more than 5 % of contradicting a correct declared quality level. The risk of failing to contradict an incorrectly declared quality level which is related to the LQR is no more than 10 %. The sample sizes for level 0 are designed in a way that the LQR factors of the sampling plans are compatible with the LQR factors for level I. In contrast to the procedures in the other parts of the ISO 2859 series, the procedures in this document are not applicable to acceptance assessment of lots. Generally, this document mainly focuses on controlling type I error, which differs from the balancing of the risks in the procedures for acceptance sampling. This document can be used for various forms of quality inspection in situations where objective evidence of conformity to some declared quality level is to be provided by means of inspection of a sample. The procedures are applicable to entities such as lots, process output, etc. that allow random samples of individual items to be taken from the entity. The sampling plans provided in this document are applicable, but not limited, to the inspection of a variety of targets such as: — end items; — components and raw materials; — operations; — materials in process; — supplies in storage; — maintenance operations; — data or records; — administrative procedures; — accounting procedures or accounting entries; — internal control procedures. This document considers two types of quality models for discrete items and populations, as follows. i) The conforming-nonconforming model, where each item is classified as conforming or nonconforming, and where the quality indicator of a population of items is the proportion p of nonconforming items, or, equivalently, the percentage 100 p of nonconforming items. ii) The nonconformities model, where the number of nonconformities is counted on each item, and where the quality indicator of a population of items is the average number λ of nonconformities found on items in the population, or, equivalently, the percentage 100 λ of nonconformities on items in the population.
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