context: It is probably the case that Sandra left the football. There is a very good chance that Greg is gray. It is unlikely that Brian is white.
hypothesis: There is a very good chance that brian is white, or Greg is gray.
valid_hypothesis: There is a very good chance that brian is white, or Greg is gray.
invalid_hypothesis: Chances are slight that brian is white, or Greg is gray.
hypothesis_assertion: Brian is white, or Greg is gray.