General election 2019: What is an opinion poll?
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People can be asked which party they would vote for, which issues most concern them, or for their views on party leaders. So, a party that is predicted to have 10% more of the vote than its main rival, for example, will not always end up with 10% more MPs.They are not perfect, but the average of errors on polls going back more than 70 years is only a couple of points, says Will Jennings of the University of Southampton.What happened in recent elections?A review by the British Polling Council said that polls before the 2015 voteThe review suggested the main reason was unrepresentative sampling.
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