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Acceptance Sampling for Variables: ANSI/ASQ Z1.9 (MFGO63W)

Presented by: William A. Levinson, P.E.
 
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Pre Recorded Webinar
60 minutes
  •  Thu, October 27, 2016
Event Description
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Learn the Basics of Acceptance Sampling for Variables: ANSI/ASQ Z1.9

ANSI/ASQ Z1.9 (formerly MIL-STD 414) is a formal sampling plan for products with continuous-scale (variables) data. Acceptance or rejection depends on the sample's average and standard deviation, and sample sizes and acceptance criteria are functions of the lot size, acceptable quality level (AQL), and sampling level. Switching rules similar to those for ANSI/ASQ Z1.4 (MIL-STD 105) determine whether sampling is at the normal, tightened, or reduced level.

Note: This course uses tables from MIL-STD 414 (public domain government publication) and not ANSI/ASQ Z1.9 (copyrighted). The sample codes differ between the standards, but the actual procedure for using them is essentially identical.

Session Highlights

  • Sampling by variables (real numbers) is far more efficient than sampling by attributes (good or bad) in terms of sample size, although it requires physical measurement of the quality characteristic as opposed to a go/no-go decision. ANSI/ASQ Z1.9 prescribes formal sampling plans for variables data.
  • Know that these plans rely on the assumption that the quality characteristic follows a normal or bell curve distribution.
  • Know how to select the acceptable quality level (AQL) and sample size code letter based on the specified AQL, the lot size, and the inspection level.
  • Know how to select the appropriate sampling plan in terms of sample size n and acceptability constant k depending on whether the variation is known or unknown, and whether the specification is one sided or two sided.
  • Know how to calculate the acceptability criterion (standard deviations between the specification and the specification limit), also known as the quality index.
  • Know how to estimate the nonconforming fraction of the lot and compare it to a tabulated value (Form 2 method)
  • Know that the sample range can also be used to estimate the variation.

Session Benefits

The key practical takeaways are as follows:

  • Know how to use the AQL conversion chart to select an AQL for use in the sampling tables.
  • Know how to select the correct sample size code letter.
  • Know how to select the sampling plan depending on whether the inspection is Form 1 or Form 2.
    • Form 1 compares an acceptance criterion to a tabulated k value. The acceptance criterion is proportional to the distance between the sample average and the specification limit; larger is better.
    • Form 2 estimates the nonconforming fraction from the sample's mean and standard deviation. The presentation will show how to estimate the nonconforming fraction.
  • Know how to use switching rules for normal, tightened, and reduced inspection.

Who Should Attend

  • Quality managers
  • Engineers
  • Technicians
About Our Speaker(s)

William A. Levinson | Quality and Productivity Management SpeakerWilliam A. Levinson P.E.
William A. Levinson, P.E., is the principal of Levinson Productivity Systems, P.C. He is an ASQ Fellow, Certified Quality Engineer, Quality Auditor, Quality Manager, Reliability Engineer, and Six Sigma Black Belt. He is also the author of several books on quality, productivity, and management, of which the most recent ... More info

 
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    Event Title: Acceptance Sampling for Variables: ANSI/ASQ Z1.9
    Presenter(s): William A. Levinson, P.E.

 
 
 
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