Elena conducted an investigation to see whether cognitive behavioral therapy (CBT) delivered via a self-help smartphone app was as effective as CBT delivered in a weekly face-to-face group workshop for managing social anxiety. Elena posted an advertisement on a popular mental health support blog, and individuals who wanted to participate could email her directly to sign up.
Her participants came from a range of backgrounds and had been diagnosed with varying levels of social anxiety disorder. They were allocated to one of two groups:
After completing the six-week programme, Elena asked each participant if their social anxiety symptoms had improved, stayed the same, or worsened.
Explain one weakness of Elena using a volunteer sampling technique in her investigation.
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.