context: It is probably the case that Jessica is a cat. It is highly likely that John went to the hallway. Chances are about even that Brian is a lion. We doubt that if either Brian is a lion, or John went to the hallway, then Julius is a frog. It is likely that if Jessica is a cat, and Brian is a lion, then Greg is green. We believe that if John went to the hallway, and Brian is a lion, then Mary got the football.
hypothesis: There is almost no chance that either John went to the hallway, or Julius is a frog.
valid_hypothesis: There is a very good chance that either John went to the hallway, or Julius is a frog.
invalid_hypothesis: There is almost no chance that either John went to the hallway, or Julius is a frog.
hypothesis_assertion: Either John went to the hallway, or Julius is a frog.