A sports scientist is conducting a study to compare the effectiveness of two post-exercise recovery methods: Cryotherapy (Group A) and Active Recovery (Group B). There are 120 amateur runners participating in the trial. The scientist assigns the first 60 runners who sign up for the study to Group A and the remaining 60 runners to Group B.
For each participant, the scientist records their perceived muscle soreness rating 24 hours after completing a marathon.
One way of improving this study would be to use random allocation to assign the runners to the two groups. Explain how random allocation could have been carried out 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.