context: We believe that Brian is yellow. It is improbable that Julius is a rhino. We believe that Mary went to the office.
hypothesis: Chances are about even that either Mary went to the office, or Brian is yellow.
valid_hypothesis: Chances are about even that either Mary went to the office, or Brian is yellow.
invalid_hypothesis: It is almost certain that either Mary went to the office, or Brian is yellow.
hypothesis_assertion: Either Mary went to the office, or Brian is yellow.