Margin of Error Calculator
The margin of error for a mean at a chosen confidence level.
Result
Margin of error
2.9400
How it works
Margin = z · (SD ÷ √n)
The margin of error is the ± range around a result. A larger sample or lower confidence level both make it smaller.
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Frequently asked questions
What shrinks the margin of error?
A bigger sample size, a smaller standard deviation, or a lower confidence level.
Is a smaller margin always better?
It means more precision, but it usually requires a larger, costlier sample.
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