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by nekusar
32 days ago
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Yes, it is, if its sufficiently random. In fact, 385 people is enough for 350M people, if sufficiently random. n = (ZZp(1-p))/(EE) n = sample size Z = confidence (studies are usually 95%) p(1-p) = variance of binormal proportion, usually set p=.5 E = margin of error (is 1.00-.95 or .05) |
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