Margin of Error Calculator
Calculate the margin of error for statistical estimates and surveys.
Margin of Error: —
Uses the standard normal (Z) distribution.
Example
Standard deviation = 12
Sample size = 400
Confidence level = 95%
→ Margin of Error ≈ ±1.18
Sample size = 400
Confidence level = 95%
→ Margin of Error ≈ ±1.18
What is margin of error?
The margin of error measures the maximum expected difference between the true population parameter and a sample estimate.
Why is margin of error important?
It quantifies uncertainty in surveys, polls, and statistical studies, helping interpret results more accurately.
Frequently Asked Questions
Is margin of error the same as confidence interval?
No. The margin of error represents half the width of a confidence interval.
What affects the margin of error?
Larger sample sizes reduce the margin of error, while higher confidence levels increase it.