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Glossary Math & Statistics

t-test

A t-test judges whether the difference between means, from one or two small samples, is bigger than chance would explain.

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In more detail

It divides the difference by its standard error and compares the result with the t distribution, which has heavier tails than the normal for small samples. The output is a t statistic and a p-value.

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Run a one-sample, two-sample (Welch or pooled) or paired t-test on your data.

See also

  • Glossary p-value
    A p-value is the probability of seeing results at least as extreme as yours if there were really no effect.
  • Glossary Confidence interval
    A confidence interval is a range around a sample estimate that would contain the true value in a stated share (such as 95%) of repeated.
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