context: It is highly likely that Bernhard is gray. Chances are slight that Mary is in the hallway. We believe that Sandra left the football.
hypothesis: There is a better than even chance that sandra left the football, and Mary is in the hallway.
valid_hypothesis: There is little chance that sandra left the football, and Mary is in the hallway.
invalid_hypothesis: There is a better than even chance that sandra left the football, and Mary is in the hallway.
hypothesis_assertion: Sandra left the football, and Mary is in the hallway.