Dr. Aris wants to design a laboratory experiment to investigate whether exposure to artificial blue-wavelength light (compared to dim red light) prior to sleep affects salivary melatonin levels in participants.
Describe a procedure Dr. Aris could use for this laboratory experiment.
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.