context: Chances are slight that Bill is in the school. It is almost certain that Julius is green. It is probably not the case that Brian is white.
hypothesis: It is probably not the case that either Bill is in the school, or Brian is white.
valid_hypothesis: It is probably not the case that either Bill is in the school, or Brian is white.
invalid_hypothesis: There is a very good chance that either Bill is in the school, or Brian is white.
hypothesis_assertion: Either Bill is in the school, or Brian is white.