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Sample Size Calculator
Want to take a survey but not sure how many responses to collect? This calculator gives you the number for any given population size and desired confidence level. A reverse calculator lets you enter characteristics of an existing survey and gives the confidence interval (plus-or-minus number) to apply to the results. This site, sponsored by a survey software company, also gives clear explanations of statistical significance, survey design, and related concepts.
http://www.surveysystem.com/sscalc.htm
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