{"blocks": [{"key": "a0ce0dd5", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "f2b760c1", "text": "The company releases an optional smart speaker and wants to understand its effect on user engagement, but users self-select into purchasing.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "ae53b649", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "98526479", "text": "Without being able to run a forced A/B test, how would you measure the causal impact of owning the speaker on engagement? Describe your preferred design and why.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "2186672b", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "61398546", "text": "Discuss quasi-experiments: difference-in-differences, propensity-score matching, instrumental variables, pre-post checks.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}