Effect of sample size on probability of acceptance - Metrology & Quality Control

Q.  What is the effect of sample size on probability of acceptance?
- Published on 07 Aug 15

a. sample size has no effect on probability of acceptance
b. as number of items in a sample decrease, higher is the possibility of number of defectives thereby probability of acceptance decreases
c. as number of items in a sample increase, higher is the possibility of number of defectives thereby probability of acceptance decreases
d. none of the above

ANSWER: as number of items in a sample increase, higher is the possibility of number of defectives thereby probability of acceptance decreases

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    Discussion

  • Sravanthi   -Posted on 27 Oct 15
    - Operating characteristics curve is obtained when probability of acceptance is plotted against percent defectives.

    The different characteristics of O.C. Curve are
    1) Acceptable quality level
    2) Lot tolerance percent defective
    3) Indifferent quality level
    4) Average outing quality
    5) Effect of sampling size, lot size and acceptance number

    Effect of sample size on probability of acceptance is as follows:

    - If N and C are constant, steeper curve is obtained if value of n is large. This gives a better discrimination between good and bad lots.

    - Probability of acceptance reduces as number of items in a sample increase. As the number of items increase, large number of defects are observed and these if exceed acceptance number, probability of acceptance reduces.

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