context: It is almost certain that John dropped the milk. Chances are slight that Mary went to the garden. There is a very good chance that Bill is in the school.
hypothesis: We believe that john dropped the milk, and Bill is in the school.
valid_hypothesis: We believe that john dropped the milk, and Bill is in the school.
invalid_hypothesis: There is little chance that john dropped the milk, and Bill is in the school.
hypothesis_assertion: John dropped the milk, and Bill is in the school.