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.
57 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.