Research Statistics
Margin of Error Calculator
Estimate the sampling margin of error for a population proportion from a sample size and selected confidence level.
Approximate margin of error
percentage points at the selected confidence level
Understanding margin of error
A margin of error describes the expected sampling uncertainty around an estimated population proportion under the assumptions of the calculation. Larger samples generally produce smaller margins of error.
Sample size
Increasing the sample generally reduces sampling uncertainty.
Confidence
Higher confidence levels generally produce wider intervals.
Proportion
The assumed proportion affects the estimated sampling variability.
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