Two Sample Z-Test Calculator

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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