A sports scientist wanted to investigate the efficacy of two recovery protocols on post-reconstruction knee rehabilitation times.
The scientist selected a stratified sample of 40 injured athletes from a database containing 240 professional athletes and 160 amateur athletes. The selected sample consists of 24 professional athletes and 16 amateur athletes.
The participants were assigned to one of two conditions:
The scientist wants to randomly allocate the 40 athletes in their stratified sample to the two recovery protocols. To control for the confounding variable of pre-existing physical conditioning, they require an equal number of professional athletes in each group (12 in each) and an equal number of amateur athletes in each group (8 in each).
Explain how the scientist would do this.
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.