A psychologist wants to find out whether a five-minute breathing exercise before an exam reduces anxiety. One group of students does the breathing exercise and another group does not. All students then rate their anxiety on a scale from 1 to 10.
Write a null hypothesis for this study.
5 exam-style questions on Oxford AQA IGCSE Psychology 2.4 Research methods, covering 2.4.1 Research methods (shared with Paper 1). Each one has a worked solution and a mark scheme showing where the marks go.