Which is not a sound practice to use for conducting interviews, which is the fourth step of a scientific poll? a) training each interviewer to use an appropriate tone of voice and word choice b) calling randomly chosen phone numbers from randomly chosen area codes c) conducting in-person interviews and telephone interviews in the same poll

The practice which is not sound in conducting individuales is C) conducting in-person interviews and telephone interviews in the same poll.

In-person interviews deliver the most representative results. Telephone surveys provide a good alternative but  they need using a larger sample.

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