Premise: A participant in a sporting event has landed on his head while holding the ball on a field of grass .
Correct statement: There is a better than even chance that a football player has hit his head on the ground during a game .
Incorrect statement: There is almost no chance that a football player has hit his head on the ground during a game .
Correct statement: It is probably not the case that a participant has caught the ball .
Incorrect statement: It is certain that a participant has caught the ball .
Correct statement: It is probably the case that a tall person holds a ball
Incorrect statement: We doubt that a tall person holds a ball
Correct statement: It is probably the case that a boy with a concusion holds a football
Incorrect statement: It is impossible that a boy with a concusion holds a football
Correct statement: It is impossible that the player has a concussion .
Incorrect statement: It is almost certain that the player has a concussion .