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Confidence Interval for a Difference in MeansStatLens

Choose a dataset:

Edit or paste two columns (CSV with headers, group and value):

Open a CSV, TSV, or JSON file:

Group 1 Group label: Mean (x₁): SD (s₁): n₁:

Group 2 Group label: Mean (x₂): SD (s₂): n₂:

Results update as you type — no need to press anything.

Grouping variable: Response variable:

Confidence level

Confidence level % — or drag the critical values on the plot

Select a dataset or enter summary statistics — the interval appears automatically.

Testing a hypothesis? Two-Sample t-Test →

Keyboard Shortcuts

Estimate the difference between two population means with a confidence interval. Set the confidence level (or drag the critical values on the plot) and read the interval.

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