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Advantages are:

1. Fewer investigators are needed

2. It is not so costly to obtain a sample

Disadvantages are:

1. There is the possibility of bias if, for example, only if a small number of regions are selected

2.The method is not truly random as once the final sampling areas have been selected the rest of the population cannot be in the sample.

If the population is heterogeneous, the areas chosen should reflect the full range of the diversity. Otherwise, choosing some areas and excluding others (even if it is done randomly) will result in a biased sample.

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