Z Test P Value Calculator
A Z-test p value is the probability in the selected standard-normal tail(s).
Inputs and units
- Z test statistic: Enter your value in the format and unit shown.
- Alternative hypothesis: Choose Two-sided, Right-tailed, Left-tailed.
Calculation method
A Z-test p value is the probability in the selected standard-normal tail(s).
Worked example
The example values are: Z test statistic = 1.96; Alternative hypothesis = two
- P value: 0.0499956503
- Distribution: Standard normal (Z test)
Assumptions and limitations
Normal approximation only. Do not use this tool for t, chi-square or F statistics. A p value is not the probability that a hypothesis is true.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Z Test P Value Calculator FAQs
What method does this calculator use?
A Z-test p value is the probability in the selected standard-normal tail(s).
What should I check before using the result?
Normal approximation only. Do not use this tool for t, chi-square or F statistics. A p value is not the probability that a hypothesis is true.