Each click is one raw observation dropping onto the pile. The tally ticks up and the count column keeps the running frequency. That's a frequency table building itself.
True split (whole crowd)
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Fair sample says
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Biased sample says
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Press Take a fair sample and Take a biased sample. Same crowd, two handfuls — watch how far the biased one drifts from the truth.
The crowd never changes. A fair sample picks from everywhere at random; a biased one only grabs from the left corner — and then lies about the whole room.