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Diagnose Sample Ratio Mismatch in Ops Test

MediumA/B Testing & Experimentation00:00
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Scenario

Scenario

You work on an operations workflow in a marketplace app, and you’ve launched an A/B test on a new dispatch rule. Midway through the experiment, the treatment and control counts look unexpectedly uneven, and stakeholders are asking whether the result is still trustworthy.

Question

Question

How would you handle sample ratio mismatch in this operational experiment, and how would you decide whether the test can still be used for a ship decision?