An election exit poll is a poll of voters taken immediately after they have exited the polling stations. Unlike an opinion poll, which asks whom the voter plans to vote for or some similar formulation, an exit poll asks whom the voter actually voted for. A similar poll conducted before actual voters have voted is called an entrance poll. Pollsters - usually private companies working for newspapers or broadcasters - conduct exit polls to gain an early indication as to how an election has turned out, since in many elections the actual result may take hours or even days to count. Typically a question that is asked is... "who did you vote for?"
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They are an example of cluster sampling and are used because it is impractical to station interviewers at every polling place.
straw vote
sampling errorAnother VIew: PROBABILITY - as expressed in plus or minus a certain number of percentage points.
Random sampling ensures that a bias in the sampled subjects is avoided. It allows for a diverse and fairly chosen sample of the intended population.
It means that if the poll was taken over and over again, the results would match the population 95% of the time.