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Sampling Plans & Acceptance Sampling Flashcards

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  1. What does AQL stand for in acceptance sampling per ANSI/ASQ Z1.4?

    Answer: Acceptance Quality Limit

    AQL stands for Acceptance Quality Limit, defined as the quality level that is the worst tolerable process average when a continuing series of lots is submitted for acceptance sampling.

  2. In a single sampling plan, a lot is rejected when the number of defectives found in the sample is:

    Answer: Greater than the acceptance number (Ac)

    A lot is rejected when the number of defectives exceeds the acceptance number (Ac), meaning the rejection number (Re) is typically Ac + 1.

  3. The Operating Characteristic (OC) curve of a sampling plan illustrates the relationship between:

    Answer: Probability of lot acceptance and incoming lot quality

    The OC curve plots the probability of accepting a lot (Pa) against the actual lot fraction defective, showing how well the sampling plan discriminates between good and bad lots.

  4. The producer's risk (α) in acceptance sampling is the probability of:

    Answer: Rejecting a lot that meets the AQL

    Producer's risk (α) is the probability that a good lot meeting the AQL is incorrectly rejected, representing the risk borne by the supplier.

  5. In acceptance sampling, the AQL represents:

    Answer: The worst average process quality level still considered acceptable

    The AQL is the worst tolerable process average quality level for a continuing series of lots; lots at AQL quality have a high probability of acceptance.

  6. In a double sampling plan, if the number of defectives in the first sample falls between Ac1 and Re1, the inspector should:

    Answer: Draw a second sample and combine results

    When first-sample results are inconclusive (between Ac1 and Re1), a second sample is drawn and the combined defectives from both samples are compared to Ac2 and Re2.

  7. Under ANSI/ASQ Z1.4, which inspection level is used as the default unless otherwise specified?

    Answer: Level II

    Inspection Level II is the default general inspection level in ANSI/ASQ Z1.4 and provides a balanced trade-off between sample size and discrimination.

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Sources & references

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  1. asq.org — Eligibility, exam format, score release, renewal, score validity, passing score, retake policy, fees, retake fee, registration deadline · verified Oct 2026
  2. prometric.com — Test delivery · verified Oct 2026