Psychology for VCE Units 1 and 2, 9e learnON & PrintAbout this resource ix Acknowledgements xvi Exam terminology 1 Psychology Key science skills and research methods 1 Key science skills and research methods in psychology 3 1. 1 Overview 4 1. 2 Aims, hypotheses and variables 11 1. 3 Scientific investigation methodologies 25 1. 4 Controlled experiments 36 1. 5 Correlational studies 47 1. 6 Self reports 54 1. 7 Observational studies 62 1. 8 Case studies 69 1. 9 Simulation studies 73 1. 10 Sources of