Premise: A group of young men is buried up to their chest in sand .
Correct statement: It is impossible that the young men can not move their arms or legs .
Incorrect statement: It is certain that the young men can not move their arms or legs .
Correct statement: It is impossible that some of the young men are not buried in the sand .
Incorrect statement: It is certain that some of the young men are not buried in the sand .
Correct statement: Chances are slight that a group of guys at a beach resort .
Incorrect statement: We believe that a group of guys at a beach resort .
Correct statement: It is impossible that a group of men standing in mud .
Incorrect statement: There is a better than even chance that a group of men standing in mud .
Correct statement: There is almost no chance that college students are enjoying the beach .
Incorrect statement: It is probable that college students are enjoying the beach .