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Confidence Interval for a Regression SlopeStatLens

Choose a dataset:

Paste data (two numeric columns with headers, CSV):

Open a CSV, TSV, or JSON file:

Slope (b₁): SE of slope: Sample size (n):

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

X variable (explanatory): Y variable (response):

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? t-Test for Regression Slope →

Keyboard Shortcuts

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

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