Premise: Skier takes a steep path down the mountain .
Correct statement: It is impossible that skier is sking in Vermont
Incorrect statement: Chances are about even that skier is sking in Vermont
Correct statement: It is probably the case that a skier checking out a hill
Incorrect statement: It is unlikely that a skier checking out a hill
Correct statement: It is certain that there is snow on the ground .
Incorrect statement: It is probably not the case that there is snow on the ground .
Correct statement: It is certain that a skiier is swerving down the mountain .
Incorrect statement: We doubt that a skiier is swerving down the mountain .
Correct statement: We believe that a skier takes a treacherous route down the mountain .
Incorrect statement: It is improbable that a skier takes a treacherous route down the mountain .