Representative of all the locations and she only samples customers from Chicago for the survey, she is doing Judgment sampling.
In the non-probability sampling technique known as judgment sampling, or authoritative sampling, the researcher chooses the units to be sampled based on his own prior knowledge or his professional judgment. Purposive sampling, also known as judgmental, selective, or subjective sampling, is a type of non-probability sampling in which researchers pick individuals from the public to take part in their surveys based on their own judgment. Three circumstances make the use of judgemantal sampling appropriate: (1) choosing distinctive respondents who are particularly instructive; (2) choosing members of a hard-to-reach, niche community; and (3) identifying specific sorts of respondents for in-depth examination.
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