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The app unbundles presentation from coverage. Users can make the news more fact-driven and less opinionated ("Facts Only") or make it more slanted (conservative or liberal). Or they can make it less complex, more entertaining, or change the sentiment (positive or negative). 2/5
On the first question, I included a standard attention check. It had no problem picking the top and bottom options. It didn't even bother asking me for help on this.
2/ We recruit a sample of more than 500 economists and ask them to evaluate different hypothetical research studies. We vary whether a given study had a large and statistically significant main effect or a low and not statistically significant main effect.