Maths & numbers
Standard error of the mean
Summarise sample variability and the standard error of its mean.
A clear answer. Here’s how.
Uses sample standard deviation with denominator n−1, then standard error = sample standard deviation / √n. Needs at least two finite values. The interpretation assumes an appropriate independent sample; this tool does not test sampling assumptions.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Numbers, separated by spaces or commas
- 2, 4, 4, 4, 5, 5, 7, 9
Example result
- Sample size
- 8
- Mean
- 5
- Sample standard deviation
- 2.1380899353
- Standard error
- 0.755928946018