An occupational psychologist wants to investigate the relationship between daily physical activity and subjective workplace stress among employees of a large multi-national corporation. To recruit participants, they placed a sign-up sheet on the bulletin board inside the head-office staff gym, selecting the first 50 employees who responded.
Outline one way in which this sample was biased.
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.