context: It is likely that Greg is a swan. We believe that Julius is gray. It is unlikely that Mary picked up the apple.
hypothesis: There is a better than even chance that either Greg is a swan, or Mary picked up the apple.
valid_hypothesis: There is a better than even chance that either Greg is a swan, or Mary picked up the apple.
invalid_hypothesis: Chances are slight that either Greg is a swan, or Mary picked up the apple.
hypothesis_assertion: Either Greg is a swan, or Mary picked up the apple.