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People never seem to realize that a great many of the logical fallacies they engage in every day could be avoiding if they just understood Regression to the Mean!
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@freemo apart from that, having a rough idea of the relationship between sample size and confidence interval would improve estimation accuracy by a lot. It's amazing how often I see people claim that, in order to achieve an ±N% margin of error, a pollster must survey (100 - N)% of the population.
