context: We believe that Greg is yellow. Chances are slight that Daniel left the football. It is probably not the case that John got the milk.
hypothesis: It is improbable that daniel left the football, and Greg is yellow.
valid_hypothesis: It is improbable that daniel left the football, and Greg is yellow.
invalid_hypothesis: It is likely that daniel left the football, and Greg is yellow.
hypothesis_assertion: Daniel left the football, and Greg is yellow.