Design A followed a large cohort over time and checked depression using more than one source. Design B followed a small clinical group through therapy using repeated self-report scores, without a control group.
Compare the strength of the conclusions about depression that Designs A and B can support.
40 exam-style questions on Edexcel GCSE Psychology 3.2 Studies, covering 3.2.1 Caspi et al. (2003) and 3.2.2 Young (2007). Each one has a worked solution and a mark scheme showing where the marks go.