context: It is probably not the case that Greg is a frog. It is probably not the case that Brian is gray. Chances are about even that Fred went to the hallway.
hypothesis: Chances are about even that either Fred went to the hallway, or Brian is gray.
valid_hypothesis: Chances are about even that either Fred went to the hallway, or Brian is gray.
invalid_hypothesis: It is almost certain that either Fred went to the hallway, or Brian is gray.
hypothesis_assertion: Either Fred went to the hallway, or Brian is gray.