{"blocks": [{"key": "19cfb8bb", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "363a3ad9", "text": "An A/B test changed a button’s color from green to red; retention dropped. Stakeholders suspect traffic allocation problems.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "2cc92afb", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "51e1c2c8", "text": "How would you investigate whether the traffic distribution between control and treatment caused the retention decrease? Which diagnostics, balance checks, or statistical tests would you run before concluding the new color hurts retention?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "a160caf3", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "d3cbf2e9", "text": "Discuss randomization sanity checks, covariate balance, sequential testing bias, and segment-level retention comparisons.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}