Statistics

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.

Calculated Output

p-value 0.05

Formula: Tail area of the standard normal beyond z

Step-by-Step Breakdown

1. Values used:

2. Z test statistic = 1.96

4. p-value = 0.05

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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.