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.
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
