context: We doubt that John dropped the milk. There is little chance that Brian is a rhino. It is likely that Greg is gray.
hypothesis: Chances are about even that brian is a rhino, and Greg is gray.
valid_hypothesis: It is highly unlikely that brian is a rhino, and Greg is gray.
invalid_hypothesis: Chances are about even that brian is a rhino, and Greg is gray.
hypothesis_assertion: Brian is a rhino, and Greg is gray.