That quality of evidence which renders it properly applicable in determining the answer to a question; that which when added to an exhibit renders it evidence.
Getting statistical significance is not necessarily the end of the story. In any experiment you would also want to see practical significance, which is not always present. In practical terms, the statistically significant difference may be so small as to be irrelevant. Noe that we may see practical significance in a sample, but we cannot conclude that this is a real effect in the population unless we also have statistical significance.
Definition Relevance, in the common law of evidence, is the tendency of a given item of evidence to prove or disprove one of the legal elements of the case, or to have probative value to make one of the elements of the case likelier or not. Evidence that is irrelevant has no bearing on any of the issues, and the rules of evidence exclude it.