Premise: A group of people sitting on benches at a city park .
Correct statement: It is impossible that a tourist group is waiting on their guide .
Incorrect statement: We believe that a tourist group is waiting on their guide .
Correct statement: It is impossible that some people are texting on their phones .
Incorrect statement: Chances are about even that some people are texting on their phones .
Correct statement: It is impossible that a group of people are sitting on a park bench listening to a street violinist .
Incorrect statement: Chances are about even that a group of people are sitting on a park bench listening to a street violinist .
Correct statement: It is impossible that some people are wearing sweaters .
Incorrect statement: It is almost certain that some people are wearing sweaters .
Correct statement: There is a better than even chance that group of people sitting on benches waiting for race to begin
Incorrect statement: Chances are slight that group of people sitting on benches waiting for race to begin