Dr. Marcus investigated the relationship between caffeine consumption and reaction time in night-shift workers. He selected his sample by approaching staff members taking breaks in the hospital canteen between 1:00 am and 3:00 am.
Explain one strength of the opportunity sampling technique used by Dr. Marcus in his investigation.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.