Why do scientific experiments (mainly in neuroscience and psychology) need to be done on more than 1 person? I was under the impression that the most important part of determining the study’s accuracy was to ensure that the outcome had a less than 5% chance of occurring without the theorised variable.
Couldn’t a situation emerge where the outcome was almost certainly attributed to the variable in question even with one person. For example, something extremely random, like (stupid example) a blood clot forming in someone’s left pinky finger after being reminded of childhood trauma (and it was predicted beforehand).
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Things affect people in different ways and it’s important to find out risk factors and things that can potentially make you more vulnerable to negative side affects (if it’s a study about that sort of thing) but basically everyone is different and they need a large sample size to represent as many people as possible
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