Tamanna was researching on problem of under-age workers at factories. She met a suitable child and interviewed him. He put her in contact with three another workers. Those three workers brought her in contact with ten other underage workers. This process of sampling is known as:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Snowball sampling
The researcher starts with one suitable member of a hard-to-reach group, and each person interviewed leads her to more members, so the sample grows like a rolling snowball. This is snowball sampling. It is used when the population is hidden or hard to list, such as under-age workers.
Why the other options are incorrect
Option (1) Judgement sampling — Incorrect. In judgement sampling the researcher herself chooses the members she considers typical; here the respondents lead her to the next members.
Option (2) Voluntary Response Sampling — Incorrect. In voluntary response sampling people choose themselves to take part (for example, by answering an open survey).
Option (3) Cluster sampling — Incorrect. In cluster sampling the population is divided into groups and whole groups are selected at random.