Question: Biased Sample. In a survey before a general election (as opposed to a primary), a sample is drawn randomly from a list of registered Democrats.

Biased Sample. In a survey before a general election (as opposed to a primary), a sample is drawn randomly from a list of registered Democrats. Is there anything wrong with this sampling method?

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In a survey before a general election (as opposed to a primary), a sample is drawn randomly from a list of registered Democrats. Is there anything wrong with this sampling method?

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