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
A mission NASA might kill is still returning fascinating science from
Jupiter
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"We can’t quite afford to support everything that we have done in the past."
6 hours ago
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