Dr Aris conducted a correlational study to investigate whether there was a relationship between salivary cortisol levels (measured in nmol/L\text{nmol/L}nmol/L) and the volume of the left hippocampus (measured in mm3\text{mm}^3mm3) in chronically stressed adults.
Outline one strength and one limitation of using a correlational research design in this investigation.
82 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.