A health psychologist wants to use a correlational design to investigate the relationship between the average weekly duration of active engagement in urban green spaces (in hours) and physiological stress, measured using salivary cortisol concentrations (in μg/dL\mu\text{g/dL}μg/dL). The psychologist recruits a sample of 30 desk-bound corporate lawyers from a single firm in London to participate.
Explain one way that the design of this study could be modified to increase the generalisability of its findings.
201 exam-style questions on OCR A Level Psychology Planning and conducting research. Each one has a worked solution and a mark scheme showing where the marks go.