What are pitfalls of observational studies?
A: It might result ethical issue
B: it is difficult to ensure a valid counterfactual
C: we might not think of all the control variables
D: some variables are very hard to measure
A: It might result ethical issue
B: it is difficult to ensure a valid counterfactual
C: we might not think of all the control variables
D: some variables are very hard to measure
B
举一反三
- 【多选题】What does “Market Segmentation” include? A: Geographic variables B: Demographic variables C: Psychographic variables D: Product-use variables
- I think it _______ more and more difficult for small shops to survive. A: will might be B: might will be C: definitely be D: will definitely be
- ____ we is known to all, English is not very difficult to learn. A: What B: As C: That D: Which
- What might we connect a perfume with?
- –What do you think the noise was? –It (__) a cat. A: may be B: might be C: could have been D: might have been
内容
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It is because Chinese is very useful ______. A: that we study it very hard B: why we study it hard C: what we study it hard D: which we study it hard
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Animals' feelings are very difficult to measure, which make the hedonistic view hard to work with on a practical level.
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What we measure is more critical to the control process than how we measure.
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According to some publishers, what might be the future of books like?
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I think I might have. My wrists hurt all the time.