![]() Level III will give a lower risk of accepting a lot with excessive number of defects. Level III equals 160 percent of the amount of inspection Level II. Level I is required only 40 percent of inspection level II and can be used where less discrimination is needed. Level II is considered the norm (except for small sample sizes). The general inspection levels (I to III) are commonly used for non-destructive inspection.How to choose between general and special inspection levels? On the other hand, if the lot fails the sampling plan, one can state with 95% confidence that the quality level of the lot is worse than the AQL. If the lot passes the sampling plan, one can state with 95% confidence that the quality level of the lot is equal to or better than the AQL (i.e., the defective rate of the lot < AQL). This means lots at or better than the AQL are accepted at least 95% of the time and rejected at most 5% of the time.Īssociated with the AQL is a confidence statement one can make. It is generally defined as the percent defective – Non Conformances- (defectives per hundred units X 100%) that the sampling plan will accept 95% of the time. The AQL of a sampling plan is a level of quality routinely accepted by the sampling plan. ![]()
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