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To construct an operating characteristic curve, an agreement has to be reached between producer and consumer through which of the following points? 1. Maximum proportion of defectives that will make the lot definitely unacceptable 2. The producer is willing to accept that some of satisfying the quality level (AQL) will be rejected (α = 5%) 3. Maximum level of percentage defectives that will make the lot definitely unacceptable 4. The consumer is willing to take lots of quality level (LTPD) even though they are unacceptable (β = 10%)

To construct an operating characteristic curve, an agreement has to be reached between producer and consumer through which of the following points? 1. Maximum proportion of defectives that will make the lot definitely unacceptable 2. The producer is willing to accept that some of satisfying the quality level (AQL) will be rejected (α = 5%) 3. Maximum level of percentage defectives that will make the lot definitely unacceptable 4. The consumer is willing to take lots of quality level (LTPD) even though they are unacceptable (β = 10%) Correct Answer 1, 2, 3 and 4

Explanation:

  • The operating characteristics curve for an attribute sampling plan is a graph of fraction defective in a lot against the probability of acceptance.
  • For different sampling plans, the operating characteristics curve will be different. To construct we should know the mathematical probability of accepting lots with varying percent defectives.

Acceptance Quality Level (AQL):-

  • AQL represents the maximum proportion of defectives  which the consumer finds definitely acceptable.
  • Ideally, at AQL the probability of acceptance should be one i.e.100%. the probability of rejecting the lot at AQL represents the producer’s risk.

Rejection Quality Level (RQL):-

  • RQL represents the proportion of defective which the consumer finds definitely unacceptable. The probability of accepting a lot at the RQL level represents the consumer’s risk.
  • It is also called Lot Tolerance Percentage Defective (LTPD).

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