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An open-access poll is a type of opinion poll in which a nonprobability sample of participants self-select into participation.The term includes call-in, mail-in, and some online polls.
By contrast, professional polling companies use a variety of techniques to attempt to ensure that the polls they conduct are representative, reliable and scientific.
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The most glaring difference between an open-access poll and a scientific poll is that scientific polls typically randomly select their samples and sometimes use statistical weights to make them representative of the target population.
Since participants in an open-access poll are volunteers rather than a random sample, such polls represent the most interested individuals, just as in voting.
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