Dr. Vance is investigating the effect of regular aerobic exercise on brain-derived neurotrophic factor (BDNF) levels, a biological marker of neuroplasticity. To do this, he recruits a convenience sample of 15 male competitive runners, aged 20–25, from his local athletics club.
Explain one improvement that could be made to the sample gathered by Dr. Vance for his study.
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.
