Sampling by Variables (ANSI/ASQ Z1.9, formerly MIL-STD 414)
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Speaker : WILLIAM LEVINSON
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When : Wednesday, May 07, 2025
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Time : 01 : 00 PM EST
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William A. Levinson, P.E., FASQ, CFPIM is the principal of Levinson Productivity Systems, P.C. and the author of several books on quality, productivity, and management.
ANSI/ASQ Z1.9 (formerly MIL-STD 414) is an acceptance sampling plan that uses the average measurement of a sample, and its range or standard deviation, to determine whether a production lot should be accepted. This webinar will show how to select and use sample plans.
Attendees will receive a pdf copy of the slides and accompanying notes, and an Excel spreadsheet that converts a traditional sampling plan into a sequential plan.
Learning Objectives
- A prerequisite for this plan is that the quality characteristic follow a normal (bell curve) distribution
- Switching rules for normal, tightened, and reduced inspection
- Selection of the sampling plan including the sample size
- Is the sample variation known or unknown? Different systems are available for both situations
- Is the specification one-sided or two-sided? Both can be accommodated by ANSI/ASQ Z1.9 - Estimate the nonconforming fraction from the sample statistics
- Awareness of the sample range method, which uses the range rather than the standard deviation to estimate the variation
- If the variation is known (e.g. from long experience with the process), the plan is simplified considerably and smaller samples can be used. The operating characteristic (OC) curve, which shows the chance of acceptance as a function of the nonconforming fraction, when the variation is known
This webinar will also present some of the rationale behind the procedure, and this background does not appear in the standard itself.
Who Should Attend
Quality managers, engineers, and technicians, and others with responsibility for acceptance sampling activities.
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$160.00
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