context: There is a better than even chance that John moved to the office. It is probably the case that Brian is gray. We doubt that Fred is in the park.
hypothesis: It is improbable that brian is gray, and Fred is in the park.
valid_hypothesis: It is improbable that brian is gray, and Fred is in the park.
invalid_hypothesis: There is a better than even chance that brian is gray, and Fred is in the park.
hypothesis_assertion: Brian is gray, and Fred is in the park.