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      Data Scientist Interview

      What is the difference between Z test and T test?

      Interview Answers

      Anonymous

      24 Jul 2018

      True variance is known versus variance is unknown.

      Anonymous

      23 May 2019

      the main difference: population variance z-test you know the variance and mean of the population and can calculate SE based on that. t-test is that you don't know the population parameters and your SE is calculated by samples' SD

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