They used a lab experiment with 45 students which were split into 5 groups of 9
Each participant watched 7 video clips of staged crashes and answered a questionnaire about each one. They were all asked 'about how fast were the cars going when they _______ each other'
Each group was given a different verb to fill the gap, they ranged from smashed to contacted. Therefore the IV was the verb used and the DV was the estimate of speed given by participants
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