{"blocks": [{"key": "15d959bb", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "6949302c", "text": "A new feature release appears to have reduced checkout conversion on an e-commerce platform.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "6ccb9fa5", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "9ec25a32", "text": "How would you investigate whether the observed conversion drop is a real regression or random noise? Detail the metrics, slice analyses, and experimental or quasi-experimental techniques you would use.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "8f0c4554", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "58dde9a7", "text": "Time-series baselines, funnel breakdown, A/B holdouts, significance tests.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}