Error Margin for Proportion
Estimate normal-approximation error margin from sample size and proportion.
Your numbers
Size of error margin
This Wald approximation no reliable for small samples or proportions near zero or one; use Wilson or exact intervals instead.
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Formula
E = z√(p(1−p)/n)
Estimate normal-approximation error margin from sample size and proportion.
Example wey show the calculation
- Share as proportion (%)
- 50
- How many items the sample get
- 400
- Di confidence level (%)
- 95
- Size of error margin
- 4.89990996135 percentage-point difference
Where e fit work and limits
This Wald approximation no reliable for small samples or proportions near zero or one; use Wilson or exact intervals instead.
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Version of di formula: a64ddcc9dcae · Example don get check: