There is always a difference between condition A and condition B. It will be detected with careful enough measurement and/or large enough sample size (spend eno

There is always a difference between condition A and condition B. It will be detected with careful enough measurement and/or large enough sample size (spend enough money). Unless you can predict what this difference is expected to be with some precision beforehand it is not possible to legitimately attribute it to your favorite reason. I would start here: https://www.jstor.org/stable/186099 https://www.jstor.org/stable/186099