Single and double sampling plan

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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Single Sampling Video



Double sampling plans

After the first sample is tested, there are three possibilities:

   Accept the lot
   Reject the lot
   No decision

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.


double sampling plan.jpg


Fig(Double Sampling Plan)

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Double Sanpling Plan Video




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