A neuroscientist wants to investigate the effect of caffeine on motor coordination.
On Day 1, a group of 24 healthy volunteers are given a decaffeinated placebo drink and their reaction times are measured using a standard button-pressing task.
On Day 2, the same 24 volunteers are given a caffeinated drink containing 150 mg of caffeine and their reaction times are measured using the same task.
Identify the experimental design used in this study. Justify your answer.
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.