context: It is impossible that Sandra left the football. We doubt that John grabbed the apple. It is probable that Julius is a frog.
hypothesis: There is a better than even chance that julius is a frog, and John grabbed the apple.
valid_hypothesis: There is little chance that julius is a frog, and John grabbed the apple.
invalid_hypothesis: There is a better than even chance that julius is a frog, and John grabbed the apple.
hypothesis_assertion: Julius is a frog, and John grabbed the apple.