Evidence suggests that listening to binaural beats can enhance cognitive focus and attention span. To investigate this, a cognitive psychologist wants to conduct an experiment to study the effect of a daily 15-minute binaural beats session on employees working at a creative design agency called 'PixelPerfect', which has a total of 150 employees consisting of 90 graphic designers, 40 copywriters, and 20 account managers aged between 21 and 58.
Evaluate the use of stratified sampling in this study.
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.