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What are the common pitfalls that invalidate an A/B test?

Running an A/B test is easy; running a valid one is hard. The signal is naming the traps that produce confidently wrong conclusions and the fix for each. Here is the checklist a senior experimenter carries.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Running an A/B test is easy; running a valid one is hard. The signal is naming the traps that produce confidently wrong conclusions and the fix for each. Here is the checklist a senior experimenter carries.

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