context: We believe that Bill left the apple. It is probable that Greg is a swan. It is probable that John went to the garden.
hypothesis: It is highly unlikely that either John went to the garden, or Bill left the apple.
valid_hypothesis: Chances are about even that either John went to the garden, or Bill left the apple.
invalid_hypothesis: It is highly unlikely that either John went to the garden, or Bill left the apple.
hypothesis_assertion: Either John went to the garden, or Bill left the apple.