context: Chances are slight that Greg is a rhino. Chances are about even that Mary went to the hallway. We doubt that Julie is in the bedroom.
hypothesis: There is a better than even chance that mary went to the hallway, or Greg is a rhino.
valid_hypothesis: There is a better than even chance that mary went to the hallway, or Greg is a rhino.
invalid_hypothesis: It is impossible that mary went to the hallway, or Greg is a rhino.
hypothesis_assertion: Mary went to the hallway, or Greg is a rhino.