context: It is unlikely that Greg is a swan. We doubt that Mary put down the apple. It is probable that John went to the bedroom.
hypothesis: There is a better than even chance that mary put down the apple, and John went to the bedroom.
valid_hypothesis: There is little chance that mary put down the apple, and John went to the bedroom.
invalid_hypothesis: There is a better than even chance that mary put down the apple, and John went to the bedroom.
hypothesis_assertion: Mary put down the apple, and John went to the bedroom.