Transcription of Attribute and Variable Sampling Plan Design
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Attribute and Variable Sampling Plan Design
Attribute and Variable Sampling plan Design Mathews Malnar and Bailey, Inc. 466 West Jackson Street, Painesville, OH 44077. Phone: 440-350-0911. Website: E-mail: 20 April 2016. These notes are posted at 1. Agenda 1. Review Sampling plan Design for Attribute inspections 2. Variables Sampling plan Design and operation 3. Comparison of sample sizes 4. What if we don't know ? Mathews Malnar & Bailey, Inc., Variables Sampling Plans, 20 April 2016 2. Sampling plan Goal The goal of any Sampling plan is to distinguish good lots from bad lots. The observations may be Attribute or Variable . The formal hypotheses being tested are: H 0 : p = p 0 (the lot is good). H A : p > p 0 (the lot is bad).
Variables Sampling Plans When and are known and the distribution is normal the fraction defective p relative to the one-sided upper specification limit USL is z p USL where p is the tail area under the normal curve. The random sample in a VSP is used to estimate the population mean
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