The margin of error (MOE) quantifies the uncertainty in a survey result. A poll showing 60% support with ±4% MOE means the true population value likely falls between 56–64% at the stated confidence level. MOE shrinks as sample size grows.
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Pro Tip
To halve the margin of error, you need to quadruple the sample size — precision is expensive. Doubling n only reduces MOE by about 30%.
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Did You Know?
The margin of error in news reports almost always assumes a perfectly random sample — but most online polls use convenience samples, making the stated MOE statistically meaningless.
References
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