Statistics
Statistics
Confidence Interval Calculator
Compute confidence intervals for a mean or a proportion, with t- and z-based critical values.
Input
Sample data
Output
95% confidence interval
t(29) = 2.045
- Point estimate
- 100.000
- [94.399, 105.601]
- Margin of error
- 5.601
- Standard error
- 2.739
LaTeX:
$M = 100.000$, 95\% CI [94.399, 105.601]Write up your results in Underleaf
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Why journals increasingly require CIs alongside p-values
A p-value tells you whether an effect is statistically detectable. A confidence interval tells you the plausible range of the effect , which is usually what reviewers and readers actually care about. Major journals in psychology, biomedicine, and economics now require CIs in addition to (or instead of) p-values. APA-style requires reporting both. The output above gives you a ready-to-paste APA and LaTeX form.
