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Still, the exit poll sample size was especially small in Vermont, so we should watch carefully as actual results trickle in.
The Literary Digest, which had run accurate surveys before past presidential elections, spared no expense in putting together a vast poll sample of an extraordinary 2 million voters.
The science of polling has evolved since the sixties, yet pollsters are still trying to solve the same eternal problems: what to do with suspected non-voters or undecideds, and how to choose the poll sample.
You can try to control for this problem by noting the basic demographic facts of non-respondents, but you can't possibly know someone's education or income level simply by looking at them. 3. A perfect exit poll sample may not be "perfect".
The ICM poll sample size was 501 and margin of error is +/-4.5 +/-4.5%
However, the poll sample taken from Condit's congressional district held a more favorable view of Condit.
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The two "Remain" polls were carried out by phone, and ComRes, which did one of them, argues that they are more accurate, because online poll samples tend to be untypically "engaged" on the EU question.
But as Alsop points out, many of Gallup's numbers, and Kennedy's lower percentage in the earlier poll, could easily be explained by the organization's painstaking process of reducing the number of non-voters and "undecideds" in their poll samples.
Clearly a number of them thought not, as their final poll samples showed.
Perhaps one reason can be found in the Ashcroft poll (sampled 20-22 March , 2015 which suggested that 23% thought they and their family would be better off under the Conservatives, compared with 18% who thought they would be better off under Labour.
Their poll sampled 1,494 current college students.
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