I found a cool online calculator that purports to calculate the number of population participants needed in order to get your desired confidence level. It might come in handy. (although I cannot guarantee its accuracy)
http://www.custominsight.com/articles/random-sample-calculator.asp
James Watson, who helped unravel DNA’s double-helix, has died
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His work was celebrated, but he was ostracized for racist, sexist comments.
21 hours ago
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