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Single sampling plans
One sample of items is selected at random from a lot and the disposition of the lot is determined from the resulting information. These plans are usually denoted as (n,c) plans for a sample size n, where the lot is rejected if there are more than c defectives. These are the most common (and easiest) plans to use although not the most efficient in terms of average number of samples needed.
Fig(Single Sampling Plan)
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Double sampling plans
After the first sample is tested, there are three possibilities:
Accept the lot
Reject the lot
If the outcome is (3), and a second sample is taken, the procedure is to combine the results of both samples and make a final decision based on that information.
Fig(Double Sampling Plan)
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Double Sanpling Plan Video