What are some of the difficulties in gathering data through personal interviews? As food for thought, watch

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What are some of the difficulties in gathering data through personal interviews? As food for thought, watch some clips from a TV show segment called Talking to Americans (from This Hour Has 22 Minutes), in which Rick Mercer travelled to American cities and interviewed Americans about Canadian politics, geography, and weather. You will find some of these clips at www.youtube.com.
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