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There's a short straightforward answer, and a more nuanced answer. The short answer is that people were randomly assigned to the two groups. Any baseline differences between people will be equally likely to affect both groups. Will there still be differences? Absolutely. This is why researchers use statistical inference to rule out the possibility that ...


Excuse my english, I'll try my best to explain. The key concept here is "randomization", which involves randomly allocating the subjects across the different groups. If randomization is well done, this ensure that your groups are "equivalent" on all other factors that have not been explicitly accounted for in the experimental design. Thus, in theory, there ...

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