Statistics
P-value Calculator
Two-tailed p-value for a one-sample z-test with known σ.
Free to use — no sign-up or login.
Two-tailed p-value
One-tailed p-value
z-statistic
This free P-value Calculator covers Two-tailed p-value for a one-sample z-test with known σ.
Enter the P-value Calculator fields, then read the output. Statistics calculators on this site keep the formula visible beside the form, with no account required.
Using the P-value Calculator
Two-tailed p-value for a one-sample z-test with known σ. Typical inputs are Sample mean (x̄), Hypothesized mean (μ₀), Population σ and Sample size (n). How it works beside the form states the identity the P-value Calculator applies.
FAQ
How do I use the P-value Calculator?
Open the P-value Calculator, fill Sample mean (x̄), Hypothesized mean (μ₀), Population σ and Sample size (n), and read the result. Compute the z-statistic from the sample mean, hypothesized mean, σ, and n.
What formula does the P-value Calculator use?
The P-value Calculator uses the identity in How it works. In words: Compute the z-statistic from the sample mean, hypothesized mean, σ, and n.