Dr. Armando wants to study sex workers' concerns about their personal safety. She begins by contacting three sex workers through an online ad and invites them to participate in an interview. She then asks the sex workers to recommend other sex workers they might know to serve as participants in the research. What kind of sampling is Dr. Armando conducting?

Snowball sampling

Explanation:

In a snowball sampling technique, the already existing subjects or participants In the study are asked to recommend or recruiter participants from smog their peers or their friends. It is a non probability sampling method.

These already recruited sex workers are to recommend other sex workers that they know to participate in this study. So this is obviously snowball sampling.

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