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isn't it because the control and treatment groups are randomised from the same pool?



It can still be correlation. It's possible you're just attributing something to an attribute you're tracking but that's just coincidence. Without a sense of why, you can't be certain about any conclusions.


in this case they seemed to expect an effect on the amyloid plaques which cause Alzheimers and dementia (i.e. they bothered to do brain scans, not just cognitive tests)




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