A cognitive psychologist wants to conduct a laboratory experiment to investigate whether consuming a high-caffeine energy drink improves performance on a complex spatial awareness task. Participants are recruited via a sign-up sheet posted on a noticeboard in the lobby of a local fitness and bodybuilding gym.
Outline one weakness of using self-selected sampling to obtain participants for this study.
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.