Alternative to simple random sampling method in large lots - Metrology & Quality Control

Q.  Which sampling method is used when simple random sampling method becomes inconvenient to use in large lots?
- Published on 07 Aug 15

a. systematic sampling
b. stratified sampling
c. cluster sampling
d. sampling in stages

ANSWER: stratified sampling

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    Discussion

  • Sravanthi   -Posted on 27 Oct 15
    Different types of sampling methods are:

    1) Simple random sampling
    2) Systematic sampling
    3) Stratified sampling
    4) Cluster sampling
    5) Sampling in stages

    - Stratified sampling method is used when simple random sampling method becomes inconvenient to use in large lots.

    - This method divides entire lot into sub-lots. They are classified according to factors which lead to variation in product quality.

    - Later on sub samples are selected in such a way that the size of sub sample selected is proportional to sub-lot size.

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