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
Two space shuttle-era spacewalkers enter Astronaut Hall of Fame
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"Two astronauts whose careers embody excellence, leadership, and service."
6 hours ago
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