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.  

 

single-sampling-plan-for-normal-inspection.jpg

 

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.

 

double sampling plan.jpg

 

Fig(Double Sampling Plan)

See More On This Site

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

 

Double Sanpling Plan Video

 

 

 

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