From Elsmar Cove Quality Assurance and Business Standards Wiki
Curve an assessment of the probability of accepting a shipment, given the existing level of quality of the shipment. There are three types: type a curves which give the probability of acceptance for an individual lot coming from finite production (will not continue into future); type b curves which give the probability of acceptance from lots coming from a continuous process; type c curves which for a continuous sampling plan, give the long run percentage of product accepted during the sampling phase.
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