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

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