![]() ![]() Purchase the electronic PDF version of Z1.4 and Z1.9 sampling standards bundle and save nearly 25% off buying them separately. For more information about AQL, please view the resources. So though it is not a 95% confidence level, it is a 95% probability of acceptance. ![]() The operating characteristic curve (OC Curve and the tables define the AQL as the percent defective that has a 95% probability of acceptance. The standard does not specify the probability of acceptance explicitly. Some interpret it to mean if a lot has AQL percent defective or less, a lot would have a high probability of being accepted based on the sampling plan. The technical definition of AQL is the quality level that is the worst tolerable process average when a continuing series of lots is submitted for acceptance sampling. ![]() Answer ANSI/ASQ Z1.4 tables are not technically calculated based on a 95% confidence level. ![]() Question I would like to confirm if ASQ Z1.4-2008 attribute tables are calculated based on 95% confidence level? I am using Table II-A, on page 11. For more information about inspection, please view the resources found. In other words, the process is stable over time. It states “If the acceptance number has been exceeded, but the rejection number has not been reached, accept the lot, but reinstate normal inspection.” A stable process or production is less about a capability index, and more about the control chart of the data showing a stable process. When you get to the reduced inspection level (Table II-C), you need to read the footnote (†). Initially you start at normal inspection, and can move to either tightened or reduced inspection depending on how lots are dispositioned.īased on Figure 1 of the standard, the determination to move amongst the levels can be ascertained. Question I am using a reduced switching rule and I don’t understand the meaning of the numbers in the first box. Total noncomforming less than limit number? What’s my limit number?Does production stability mean capability? Would I use 1.33? The table has an arrow to reduced, so would I move to the next box? Answer The has three inspection levels: normal, reduced and tightened inspection. ![]()
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