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P-value Calculator

Calculate normal z or Student t p-values for one- or two-sided tests.

How It Works

Two-sided p=2×tail(|statistic|). A p-value is not the probability that the hypothesis is true. Choose the test and alternative before inspecting results.

Reference Sources

FAQs

How does this calculator work?

Two-sided p=2×tail(|statistic|). A p-value is not the probability that the hypothesis is true. Choose the test and alternative before inspecting results.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.