{"blocks": [{"key": "da69cd19", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "a981a6bb", "text": "Planning an A/B test for a new recommendation algorithm while limiting network effects.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "b9b87cc0", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "aa354cb1", "text": "Explain how you would apply clustered random sampling to pick test and control users. Which clusters would you choose, and why does this reduce interference? What trade-offs or risks does clustered sampling introduce?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "956f7aa7", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "58eaefb2", "text": "Think markets, friend graphs, intracluster correlation, power loss.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}