A plausible explanation would be their decisions about sample size reflects prevalent intuitive misconception of the extent of the sampling variation by the researchers. It is like exaggerating the consistency and coherence of what we see or sometimes what we want to see :), Thats the plight of modern biological science, reflects worser when it comes to cognitive science and psychology!

http://journals.plos.org/plosbiology/article?id=10.1371%2Fjournal.pbio.2000797

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