{"blocks": [{"key": "4c990b33", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "4e013bac", "text": "Product team debating whether to launch group-video calling; you must plan an experiment and choose metrics.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "828548ce", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "05be5970", "text": "a) Which additional data sources or reports would you review before deciding to add group calls?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "fdc45aa7", "text": "b) What primary success metric would you track and why?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "a23b774a", "text": "c) How would you decide the maximum participant limit?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "20831e26", "text": "d) Outline an A/B-test design (control vs treatment, metric definition, statistical considerations).", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "0f3a879f", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "84a6908f", "text": "Address user need, baseline CTR, capacity, guardrail metrics, power, and comparing treatment to control—not to itself.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}