A health psychologist conducted an experiment in whichparticipants watched a film that either did or did not include aperson being injured because of not wearing a seatbelt. A weeklater, as part of a seemingly different study, these sameparticipants reported how important they thought it was to wearseatbelts (higher scores = greater importance). The 16 participantswho had seen the injury film gave a mean rating of 8.9, with astandard deviation of 2.1. The 16 participants in the controlcondition had a mean of 7.0 with a standard deviation of 2.4.
