Purchasers of American National Standards may receive current informationon all standards by calling or writing the American National Standards Institute.00.Z1.9.fm(i-x).qxd:00.Z1.9.fm(i-x).qxd 2/17/09 2:48 PM Page iPublished by:2008 by ASQCopyright protection notice for the ANSI/ASQ Z1.9-2008 Standard.This Standard is subject to copyright claims of ANSI, and ASQ. The procedures of theAmerican National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no laterthan five years from the date of publication. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. American National Standards are subject to periodic review and users arecautioned to obtain the latest edition. The existence of an American National Standard does not in any respect preclude any-one, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, process-es, or procedures not conforming to the standard. An American National Standard is intended as a guide to aid the manufacturer, theconsumer, and the general public. AMERICAN NATIONAL STANDARD: An American National Standard implies a consensus of those substantially con-cerned with its scope and provisions. It is applicable only when the normality of the measurements is assured.

Variation may be measured by sample standard deviation, sample range, orknown standard deviation. It provides tightened, normal, and reduced plans to be used onmeasurements which are normally distributed. ANSI/ASQ Z1.9-2008AMERICAN SOCIETY FOR QUALITY600 NORTH PLANKINTON AVENUEMILWAUKEE, WISCONSIN 53201AMERICAN NATIONAL STANDARDSAMPLING PROCEDURES AND TABLES FOR INSPECTION BYVARIABLES FOR PERCENT NONCONFORMING00.Z1.9.Cover.qxd:00.Z1.9.Cover.qxd 2/17/09 2:46 PM Page iAMERICAN NATIONAL STANDARDSAMPLING PROCEDURES AND TABLES FOR INSPECTIONBY VARIABLES FOR PERCENT NONCONFORMINGPREPARED BYACCREDITED STANDARDS COMMITTEEZ1 SUBCOMMITTEE ON STATISTICSSPONSOR AND SECRETARIATAMERICAN SOCIETY FOR QUALITYANSI/ASQ Z1.9-2008ABSTRACTSampling Procedures and Tables for Inspection by Variables for Percent Nonconforming is an acceptance sampling systemto be used on a continuing stream of lots for AQL specified.

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