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Our AI writing feature's A/B test hit p < 0.05 on day three of a planned two-week run. The team wants to ship today. Do you?

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Checking an A/B test early and stopping when it looks good inflates false positives. Run to the planned horizon unless the test was designed for early stopping, and stop early only for harm.

Updated Nov 2026 · Original practice questions with worked answers and teaching rubrics. Our editorial policy explains the sources, review process and limits.

Checking an A/B test early and stopping when it looks good inflates false positives. Run to the planned horizon unless the test was designed for early stopping, and stop early only for harm.

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