{"blocks": [{"key": "497a629a", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "18e9ade8", "text": "Yahoo Mail suddenly reports a 10 % decline in daily active users (DAU).", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "647bd5e0", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "47639fa4", "text": "Walk me through how you would investigate and diagnose the root cause of the 10 % DAU drop for Yahoo Mail. What data would you pull, which funnels or cohorts would you examine, and how would you rule out internal versus external factors?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "ce45ac76", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "5186eb62", "text": "Form a hypothesis tree, segment traffic by platform, geography, user cohorts; inspect release logs, outages, marketing, seasonality, competitor news.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}