I'm using AB test calculator (http://abtestguide.com/calc/) and I'm wondering what statistical test is lying under it. Is it t-test or z-test?
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Have you tried asking the creator? – Ian_Fin Nov 29 '16 at 10:18
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The compuattions are pretty much self-explanatory. (And to answer your question they use a Z-test) – Drey Nov 29 '16 at 10:46