A readout can say a variant won and still be wrong. Five checks on how the test was stopped, counted and reported show whether the conclusion can be trusted.
A written test result can be wrong without a single wrong calculation in it. The p-value is computed correctly, the lift is real arithmetic, and the conclusion still does not follow, because of how the test was stopped, how many things were judged at once, or whether the groups were what the plan said they were. A readout is a document that can be checked on its face, before anyone looks at raw data. This guide describes five checks that need only the text of the readout and a calculator, and explains for each one why a failed check means the headline cannot be relied on.
Read the full report on AISkills402: https://aiskills402.com/blog/ab-test-readout-when-it-fails?utm_source=devto&utm_medium=social
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