context: It is improbable that Bernhard is gray. It is probable that Brian is a frog. We doubt that Sandra left the football.
hypothesis: It is probably the case that sandra left the football, or Bernhard is gray.
valid_hypothesis: It is probably not the case that sandra left the football, or Bernhard is gray.
invalid_hypothesis: It is probably the case that sandra left the football, or Bernhard is gray.
hypothesis_assertion: Sandra left the football, or Bernhard is gray.