Question:
Based on the premise "For example, a hypothetical study conducted in New York and one conducted in Seattle may report different C-R functions for the relationship between PM and mortality, in part because of differences between these two study populations (e.g.", can we conclude that "A study based in Seattle may yield different results than that in New York due to the difference in demographics."?
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Answer:
yes

Question:
Based on the premise "The victory secured independence from Spain.", can we conclude that "The war was fierce but worth it to the surviving country."?
****
Answer:
it is not possible to tell

Question:
Based on the premise "Who's he?"", can we conclude that "His name is David."?
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Answer:
it is not possible to tell