Does it have anything to do with statistics? Are they actually accurate or just estimates? How much variability is acceptable in case of an estimate? And how do they calculate what the human population was, say, 3000 years ago? I guess I’m trying to ask how large scale censuses work.
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A lot of those numbers are estimates, especially stuff like animals/fish that are always on the move or hard to identify individually. They take a sample population count for a specific area, determine how much total area that population covers, and do the math.
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