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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)

See More On This Site Single Sampling Plan

www.itl.nist.gov/div898/software/dataplot/refman1/auxillar/singsamp.htm

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.

Fig(Double Sampling Plan)

See More On This Site

www.itl.nist.gov/div898/handbook/pmc/section2/pmc24.htm

Double Sanpling Plan Video