context: We doubt that Mary moved to the garden. It is likely that Brian is a rhino. Chances are about even that John left the apple.
hypothesis: Chances are about even that either John left the apple, or Mary moved to the garden.
valid_hypothesis: Chances are about even that either John left the apple, or Mary moved to the garden.
invalid_hypothesis: It is highly unlikely that either John left the apple, or Mary moved to the garden.
hypothesis_assertion: Either John left the apple, or Mary moved to the garden.