Serious About Samples

Abstract:Sampling is a useful tool when inspecting products for defects. Samples are most effective at catching defects when they are representative, which is when all samples have an equal chance of being picked. However, sampling does not tell you where or when defects occur in the process, they only identify defects. In order to find and fix defects, other methods like statistical process control, control charts and control limits can be used. Using the right kind of sampling can aid in inspection activities, but should not be relied upon as the only means of fixing defects in a …

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Although the c=0 plans developed by Squeglia provide the same protection to the consumer as the corresponding plan in the Z1.4 standard, the producer's risks are vastly different. The producer's risk for the c=0 plan described in Table one is nearly 40% while the producer's risk for the Z1.4 plan is about 2%. Caution must be exercised when implementing the c=0 plans developed by Squeglia as the producer's risk is often overlooked in the benefit analysis of these plans and an acceptance number of zero for the sampling plans provides no assurance that the batch is defect free.
--Joseph Perry, 04-06-2018


Good information and very well explained. Saving this article for future guide lining.
--D. Glover, 04-06-2018, 04-06-2018


Excellent overview.
--Audrey Florakis, 04-05-2018


Nice summary in a nutshell for process monitoring.
--Osman Kursun, 04-05-2018


Very well explained. And interesting. Ideal article to go deeper on these topics.
--Erick Nieves, 04-03-2018


Very clear and interesting article.
--J. Rodriguez, 04-02-2018


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