context: Chances are slight that John dropped the milk. It is likely that Lily is a frog. We believe that Mary left the apple.
hypothesis: It is probable that either John dropped the milk, or Mary left the apple.
valid_hypothesis: It is probable that either John dropped the milk, or Mary left the apple.
invalid_hypothesis: We doubt that either John dropped the milk, or Mary left the apple.
hypothesis_assertion: Either John dropped the milk, or Mary left the apple.