In a field experiment, researchers experimentally manipulated a sign next to the trash cans in a park. In one condition, the sign read "DON'T LITTER," in the other condition, the sign read "Please keep your park clean." Researchers found that on average, park goers tended to throw less trash in the trash can (i.e., they littered more) when the DON'T LITTER sign was posted. The park goers in this experiment would be considered what type of participants?
A) apprehensive participants
B) nonvoluntary participants
C) involuntary participants
D) voluntary participants

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The Answer of In a field experiment, researchers experimentally manipulated a sign next to the trash cans in a park. In one condition, the sign read "DON'T LITTER," in the other condition, the sign read "Please keep your park clean." Researchers found that on average, park goers tended to throw less trash in the trash can (i.e., they littered more) when the DON'T LITTER sign was posted. The park goers in this experiment would be considered what type of participants?
A) apprehensive participants
B) nonvoluntary participants
C) involuntary participants
D) voluntary participants

In a Field Experiment, Researchers Experimentally Manipulated a Sign Next