I found a statistics question and am wondering how its figured out, the way its worded is hard to understand what everything means. anyhow..(adsbygoogle = window.adsbygoogle || []).push({});

If a coin is flipped N times, one expects to get "heads" roughly half the time. More precisely, Number of heads=N/2+Δn where Δn is the statistical variation. Typically, one expects Δn/N≈1/2√N

thats 2 multiplied by square root of N in denominator, and the question proceeds...

You sometimes see a news report of a pole asking who would be the best president. The report typically says that if two candidates' numbers differ by less than 3%, then it is a "statistical dead heat." If this means the difference is less than would be expected from the statistical variation, how many people were asked the question?

Any help with some explanation would be greatly appreciated thanks in advance.

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# Statistical variation of a flipped coin

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