A clinical psychologist has developed a new self-report questionnaire to measure the severity of generalised anxiety disorder. To evaluate this tool, she administers it to a sample of 40 patients. Three weeks later, without any treatment occurring in the interim, the same 40 patients complete the identical questionnaire under the same conditions. The psychologist then calculates a correlation coefficient between the two sets of scores to determine consistency. Which methodological property is the psychologist primarily assessing?
Concurrent validity
Inter-rater reliability
Test-retest reliability
Face validity
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.