Margin of error
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What does it mean?
The margin of error is half the width of an interval at a stated confidence level. It depends on sample size, variability and sampling design.
Think through an example.
An everyday example
Assuming simple random sampling from a large population, n=400 and p=0.50 give an approximate 95% margin of error of ±4.9 percentage points.
Test your understanding.
True or false?
Increasing the number of participants eliminates all research errors.
Make the next connection
Explore related concepts to deepen your understanding.
Sources and further reading
Explore the foundations and methodological details in these resources. Examples on this page were created for illustration.
- OpenStax Source in EnglishA Population Proportion