A **two sample z-test** is used to test whether or not the means of two populations are equal when the population standard deviations are known.

To perform a two sample z-test, simply fill in the information below and then click the “Calculate” button.

**Sample 1**

**Sample 2**

**z = ** -1.608761

**p-value (one-tailed) = ** 0.060963

**p-value (two-tailed) = ** 0.121926