An operating characteristic (OC) curve is a graph that measures
A) the acceptable proportion of defects in a lot to the consumer.
B) the probability of accepting a lot for different quality levels with a specific sampling plan.
C) the probability of accepting a lot in which the fraction of defectives exceeds the lot tolerance percent defective.
D) the maximum number of defective items a consumer will accept in a lot.

Question

Quizplus · Accepted Answer

An operating characteristic (OC) curve measures the probability of accepting a lot for different quality levels with a specific sampling plan. It helps in determining the most appropriate sampling plan for a particular situation by showing the trade-off between the producer's and consumer's risks. It also helps in setting an acceptable quality level (AQL) and determining the lot tolerance percent defective (LTPD) for a given sampling plan. A and D are incorrect because an OC curve does not measure the acceptable proportion of defects or the maximum number of defective items a consumer will accept in a lot. C is close but not as precise as B because it only considers the probability of accepting a lot in which the fraction of defectives exceeds the LTPD, whereas an OC curve considers a range of quality levels and their associated probabilities of acceptance or rejection.

An Operating Characteristic (OC) Curve Is a Graph That Measures