In the study of bystander behaviour by Piliavin et al. (1969), researchers manipulated the 'type of victim' independent variable.
Explain how this independent variable was operationalised in the study.
105 exam-style questions on OCR A Level Psychology Responses to people in need, covering Piliavin et al. (1969): Subway Samaritan and Levine et al. (2001): Cross-cultural altruism. Each one has a worked solution and a mark scheme showing where the marks go.