ATP 2-33.4, page 124

Appendix A A-20 ATP 2-33.4 18 August 2014  Rule 4. The credibility of a hypothesis is directly proportional to the number of instances in which the hypothesis was supported. Simply put, the more verifiable evidence, the greater the possibility of truth in the hypothesis.  Rule 5. Confidence in a hypothesis increases when an incompatible and rival conjecture is refuted. Very rarely is just one hypothesis considered.  Rule 6. Confidence in a hypothesis increases to the extent that it is consistent with another hypothesis that is highly credible.  Rule 7. In instances in which observables support two different hypotheses, the simpler hypothesis stands a better chance of being true.