learn.howToCalculate
learn.whatIsHeading
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.
Guide étape par étape
- 1MOE = z × √(p(1-p)/n)
- 2z = 1.96 for 95% confidence
- 3p = observed proportion · n = sample size
- 4MOE is the ± value reported alongside poll results
Exemples résolus
Entrée
n=1,000 · p=0.5 · 95% confidence
Résultat
MOE = ±3.1%
1.96×√(0.25/1000)=0.031
Entrée
n=400 · p=0.5 · 95% confidence
Résultat
MOE = ±4.9%
Halving n roughly doubles the MOE
Prêt à calculer ? Essayez la calculatrice gratuite Margin of Error
Essayez-le vous-même →