
Originally Posted by
Jeffor
Please don't bring up the polls that mean nothing. You can have a sample of 10,000 but if they are not chosen at random (which these were not) then the sample is biased and the data suspect period. Internet polls are done using a voluntary response method which never, ever accurately represents a population. To suggest otherwise is irresponsible.
Obligatory Wikipedia link: http://en.wikipedia.org/wiki/Selection_bias
Selection bias is actually one of the most difficult kinds of bias to control for, but it can have a really big effect on results.
Polls are really, really hard to conduct with any kind of accuracy. Even the professionals get it wrong sometimes.
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