context: We doubt that Mary went to the office. It is highly unlikely that Sandra grabbed the milk. It is likely that Brian is a frog. It is certain that if Mary went to the office, and Sandra grabbed the milk, then Julius is a frog. Chances are about even that if Sandra grabbed the milk, and Mary went to the office, then Lily is green. It is impossible that if Mary went to the office, or Sandra grabbed the milk, then Greg is green.
hypothesis: It is probable that either Julius is a frog, or Greg is green.
valid_hypothesis: There is almost no chance that either Julius is a frog, or Greg is green.
invalid_hypothesis: It is probable that either Julius is a frog, or Greg is green.
hypothesis_assertion: Either Julius is a frog, or Greg is green.