In a study of cognitive performance in different climates, which of the following would produce interval level data?
transcripts of participants' written thoughts about the hot weather
categorising participants as either 'dehydrated' or 'hydrated'
self-report ratings of alertness on a scale of 1 to 5
the room temperature measured in degrees Fahrenheit
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.