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Confidence Interval for a ProportionStatLens

Choose a dataset:

Paste categorical data (one value per line, or CSV):

Open a CSV, TSV, or JSON file:

Number of successes: Sample size (n): Success label (optional):

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

Variable:

Confidence level

Count as success:

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

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

Testing a hypothesis? One-Proportion z-Test →

Keyboard Shortcuts

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

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