We Gave Four Good Pollsters the Same Raw Data. They Had Four Different Results.

www.nytimes.com

This is the best article on polling I've ever read. From the article: "Pollsters usually make statistical adjustments to make sure that their sample represents the population. They usually do so by giving more weight to respondents from underrepresented groups." Read this to learn what's behind the polling numbers in the news.

Also in data in the mainstream press: you should really read this post about Skittles.

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