Two sample z-test is used to test whether the means of two populations are equal. It is used when the population standard deviations are known.

*Either enter raw data or summary information in the calculator below to calculate a two sample z-test. You can directly paste data from MS Excel.*

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Assumptions of Two Sample Z-Test

- Data in each population should be approximately normally distributed.
- Each score is sampled independently and randomly.
- Z-Test assumes you know the population standard deviations for both groups.

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