p-value Calculator

The result is unlikely under the null, so it is often called statistically significant.

Find the p-value from a z test statistic.

p-value 0.05

Formula: Tail area of the standard normal beyond z

Step-by-step with your numbers:

1. Values used:

2. Z test statistic = 1.96

4. p-value = 0.05

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The p-value is the probability of a result at least as extreme as observed, if the null is true.

The math behind it

It is the normal tail area beyond your z, doubled for a two-tailed test.

z = 1.96 two-tailed gives p about 0.05.

What does p < 0.05 mean?

The result is unlikely under the null, so it is often called statistically significant.