These two concepts are very much related, and whenever I happen to edit a question that has one of these tags I almost always feel that I should add another one too. Looking now at the top-voted questions in both tags, I don't see much of a difference in topics. However, I am not actively following any of these tags and so can easily miss some nuances. Hence my question:
Should we maybe make them synonyms? If so, what is a better master tag?
Or should we maintain some difference in usage between these tags? If so, what should this difference be? Can we hope to enforce this difference, given 6k existing questions?
There is also a very related p-value tag (950 questions)
, but I feel that it should stay separate. There are enough questions asking specifically about $p$-values, their meaning, and properties. Update following @gung's comment: Actually, [p-value] is used mostly interchangeably with the former two tags, so perhaps we should think of combining all three tags together.