Discussion
A researcher wishes to study problems of undocumented foreign migrants from African countries who are staying in Mumbai.
Which of the following sampling technique will she choose ?
Answer: B
She would choose snowball sampling.
Undocumented migrants form a hidden population: there is no list of them to sample from, and they are unlikely to come forward to strangers. In snowball sampling the researcher finds a few respondents and asks each to refer others they know, so the sample grows through the population's own networks.
Simple random, stratified and cluster sampling are probability methods. They all need a sampling frame, a list of the population or of its strata or clusters, which does not exist for this group.
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