15 Acceptance Sampling

15 Acceptance Sampling - Lesson 15 Acceptance Sampling a...

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15 - 1 a form of inspection applied to lots or batches of items before or after a process to judge conformance to predetermined standards Lesson 15 Acceptance Sampling
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15 - 2 Acceptance Sampling is very useful when . Large numbers of items must be processed in a short amount of time . The cost of “passing defectives” is low . Fatigue/boredom is caused by inspecting large numbers of items Acceptance Sampling . Destructive testing is required
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15 - 3 Sampling Plans specify the lot size, sample size, number of samples and acceptance/rejection criteria. Sampling plans involve . Single sampling . Double sampling . Multiple sampling Random sample Lot Sampling Plans
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15 - 4 Single Sampling Plan A Single Sampling Plan is one where . A representative sample of n items is drawn from a lot size of N items. . Each item in the sample is examined and classified as good/defective . If the number of defective exceeds a specified rejection number ( C - cut off point ) the whole lot is rejected; otherwise the whole lot is accepted Rando m sample (n items) Lot (N items) Rando m sample (n items) Lot (N items)
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15 - 5 A Double Sampling Plan allows the opportunity to take a second sample if the results of the original sample are inconclusive. . Specifies the lot size, size of the initial sample, the accept/reject/inconclusive criteria for the initial sample ( CL - lower level of defectives, CU - upper level of defectives ) . Specifies the size of the second sample and the acceptance rejection criteria based on the total number of defective observed in both the first and second sample ( CT- total allowable defectives ) It works like the following example Double Sampling Plan
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First Random sample Lot CL CU First sample inconclusive, take second sample Reject Lot
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15 Acceptance Sampling - Lesson 15 Acceptance Sampling a...

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