context: There is a very good chance that Brian is a lion. It is likely that Mary went to the garden. It is impossible that Fred is in the cinema.
hypothesis: Chances are about even that either Brian is a lion, or Mary went to the garden.
valid_hypothesis: Chances are about even that either Brian is a lion, or Mary went to the garden.
invalid_hypothesis: There is almost no chance that either Brian is a lion, or Mary went to the garden.
hypothesis_assertion: Either Brian is a lion, or Mary went to the garden.