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Confidence Interval for a Mean DifferenceStatLens

Choose a dataset:

Paste paired data (CSV with two numeric columns):

Open a CSV, TSV, or JSON file:

Mean difference (d̄): SD of differences (sₓ): Number of pairs (n):

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

Variable 1: Variable 2:

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? Paired t-Test →

Keyboard Shortcuts

Estimate the population mean difference for paired data with a confidence interval. Set the confidence level (or drag the critical values on the plot) and read the interval.

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