Dr. Al-Jamil is investigating the efficacy of a new wearable biofeedback patch designed to help individuals manage chronic lower back pain. He recruited participants by posting flyers in local physiotherapy clinics, asking for volunteers suffering from chronic pain.
In Condition A, participants received real-time haptic feedback reminding them of correct posture whenever muscle tension exceeded a threshold. In Condition B, participants wore an identical patch that only recorded data without providing any haptic feedback.
Explain one weakness of Dr. Al-Jamil using a volunteer sampling technique for his investigation.
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.
