The AQL for a given sampling plan is 1%. This means that:

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BlackTom AI · Accepted Answer

The question presents a statement about AQL (Acceptable Quality Level) for a sampling plan being 1%, and asks you to interpret its meaning.
Option 1: 'The average quality level of the plan is 1%.' This is not correct. AQL is not a statement about an average quality level across lots; it defines the maximum percent defective that is considered acceptable for a lot under the sampling plan. It does not describe an average defect rate.
Option 2: 'There is a small risk that lots with 1% defective or less will be rejected.' This is the most accurate interpretation. AQL serves as a threshold for acceptance, but due to the sampling process and its inherent variability, some lots that meet or are below 1% defects can still be rejected (type I error in sampling). The wording 'small risk' captures the probabilistic nature of sampling plans.
Option 3: 'All accepted lots are 1% defective or less.' This is incorrect as a blanket statement. While lots with defect rates at or below the AQL are more likely to be accepted, the sampling plan does not guarantee that every accepted lot will have 1% or fewer defects; there can be accepted lots with defect levels above 1% within the plan’s acceptance criteria.
Option 4: 'All lots are 1% defective or less.' This is false. AQL does not imply that every lot in the population meets the 1% defect rate; it merely defines the tolerance level used to decide acceptance for a given sample. Real-world lots can have higher defect rates, and some will be rejected according to the sampling rules.

ISE 4120 SP2025 (10663) QCI Chapter 5 Quiz

The AQL for a given sampling plan is 1%. This means that:

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