Standard deviation
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What does it mean?
Standard deviation measures spread using squared deviations from the mean. It has the same units as the data.
Think through an example.
Waiting times are 9, 10, 11 minutes in group A and 2, 10, 18 in group B. Both average 10; B has greater standard deviation.
Test your understanding.
Two groups with the same mean can have different standard deviations.
Make the next connection
Explore related concepts to deepen your understanding.
Put this knowledge into practice.
Practice with short steps in related tools, then test yourself.
Inspect mean and median together
Avoid reducing a numeric variable to one summary.
Read descriptive statistics together
Work with the mini survey and compare your output with the expected result.
Read descriptive statistics together
Work with the mini survey and compare your output with the expected result.
Sources and further reading
Explore the foundations and methodological details in these resources. Examples on this page were created for illustration.
- OpenStax Source in EnglishMeasures of the Spread of the Data