There are Quality Way and Quantity Way to make hypothesis . It is important to change hypotheis into proof. Then we can say "Are there cause and effect relationship between them?"
Simulation and Experiments are the methods to get proof. If repeat is difficult, Statistics is used to get valid proof.
Statistics is the way to study Correlation . Correlation could be as a hint to study cause and effect relationship.
From correlation to the proof of cause and effect, Meta Knowledge is also needed.
It is easier to prove the hypothesis found by quantity way than that of quality way because we find facts through the analysis.
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