ITPEC FE Morning April 2021 Question 77
ITPEC FE Morning April 2021 — Question 77 of 80
The OC curve (Operating Characteristic curve) shows the probability of accepting a lot as a function of its defective ratio. In sampling inspection, it is the standard tool for evaluating how likely a lot with a given defect rate will pass the acceptance criteria.
Why not others:
- (a) Bathtub curve — shows failure rate over a product's lifecycle (early failures → stable period → wear-out). Used in reliability engineering, not acceptance sampling.
- (b) Gompertz curve — an S-shaped growth curve used to model population growth, technology adoption, or software testing progress.
- (c) Logistic curve — another S-shaped growth curve used for market saturation forecasting and diffusion modeling.
Key rule: OC curve = probability of lot acceptance vs. defective ratio; Bathtub curve = failure rate vs. time.
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