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Apr 30, 2020 at 18:24 vote accept Bluewater
Apr 30, 2020 at 13:56 comment added Andreas Steimer yes. I would still go for the t-test, since, as a 1D-problem, it is conceptually simpler
Apr 30, 2020 at 12:46 comment added Bluewater I mean indeed 2018/2019. I changed this in the starting post. So the conclusion can be that i'm safe with the chi-square test or else just take the t-test instead of the z-test?
Apr 30, 2020 at 10:37 history answered Andreas Steimer CC BY-SA 4.0