context: It is probably the case that Greg is a rhino. Chances are slight that Brian is gray. It is probably the case that John grabbed the milk.
hypothesis: We doubt that either John grabbed the milk, or Brian is gray.
valid_hypothesis: It is probable that either John grabbed the milk, or Brian is gray.
invalid_hypothesis: We doubt that either John grabbed the milk, or Brian is gray.
hypothesis_assertion: Either John grabbed the milk, or Brian is gray.