A psychologist is investigating the psychological and physiological stress levels of commercial deep-sea saturation divers.
Which of the following data sources collected or used in this investigation is an example of secondary data?
Heart-rate variability measurements recorded in real-time by the researcher using telemetry sensors on the divers
Transcripts of structured interviews conducted by the researcher with the divers' family members
Daily digital mood logs completed by the divers specifically for the researcher's study during their 28-day compression period
Anonymised historical safety-incident logs from 2012 to 2022 obtained from the National Maritime Database
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.