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
One with the world? A new look at brains transformed by psychedelics.
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Participants meditated inside an MRI tube, with and without psilocybin.
1 day ago
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