context: We believe that Julius is a rhino. It is unlikely that Greg is green. Chances are about even that Bill left the milk.
hypothesis: There is a better than even chance that bill left the milk, or Greg is green.
valid_hypothesis: There is a better than even chance that bill left the milk, or Greg is green.
invalid_hypothesis: There is little chance that bill left the milk, or Greg is green.
hypothesis_assertion: Bill left the milk, or Greg is green.