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1936 Election: Biased sampling procedure

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A biased sampling procedure led to a huge prediction error in the 1936 presidential election. Even though the sample size was enormous, it could not fix a fundamentally flawed sampling procedure. The sampling frame (list of people from whom the sample was chosen) did not reflect the population, leading to a very embarrassing and fatal error for the polling company.

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Ad Populum example - Camel commercial 1949

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http://www.illogicalfallacy.com/95/common-logical-fallacies 10 Most Common Logical Fallacies This fallacious reasoning claims that if something is supported by many people, or the majority, it has to be true/good. Nowadays smoking is considered bad for our health. Some decades ago things were different. Even doctors would be used in tobacco advertisements.