The interviewees are shown to be in public places and are supposedly giving spontaneous answers, in a chance encounter, to the interviewer. Vox pops are used all the time in news programmes to show balanced views.
Each person is asked the same question(s) with the aim in mind to get as many (variety of) answers by the public on a certain subject. Therefore to get as much variety as you can, you need to ask a range of different people, age groups, gender, religion, race etc.
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