An environmental psychologist was investigating concentration levels under different environmental conditions. She randomly allocated 30 participants to two separate conditions in an experiment.
Condition A: 15 participants performed a proofreading task for 10 minutes in a room with bright, natural daylight.
Condition B: 15 participants performed the same proofreading task for 10 minutes in a room with dim, artificial light.
Identify the experimental design used in this study.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.