Question d’entretien chez Meta

What is the difference between Z test and T test?

Réponses aux questions d'entretien

Utilisateur anonyme

24 juil. 2018

True variance is known versus variance is unknown.

Utilisateur anonyme

23 mai 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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