An opinion poll is a survey of opinion from a particular sample of respondents. Opinion polls are usually designed to represent the opinions of a population by asking a small number of people a series of questions and then extrapolating the answers to the larger group within confidence intervals. Confidence intervals are used to indicate the reliability of an estimate. For example, a CI can be used to describe how reliable survey results are. All other things being equal, a survey result with a small CI is more reliable than a result with a large CI.
Opinion polls can be carried out regarding any number of subjects, from likely outcomes of an election to opinions on various popular societal issues. The success of an opinion poll can be influenced by a number of subjects, like the political situation of a country, the demographic focus of the poll, and the availability of proper communication channels to the sample.
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