context: Chances are about even that Bill left the milk. It is probably not the case that Fred went to the garden. Chances are about even that John took the apple.
hypothesis: Chances are about even that either Fred went to the garden, or Bill left the milk.
valid_hypothesis: Chances are about even that either Fred went to the garden, or Bill left the milk.
invalid_hypothesis: It is almost certain that either Fred went to the garden, or Bill left the milk.
hypothesis_assertion: Either Fred went to the garden, or Bill left the milk.