A psychologist has two research aims.
Aim 1: to find out how one child's rare speech difficulty changes over five years.
Aim 2: to find out whether drinking coffee affects reaction time.
Justify the most suitable research method for each aim.
145 exam-style questions on Oxford AQA IGCSE Psychology 1.4 Research Methods, covering 1.4.1 Hypotheses, 1.4.2 Types of variables, 1.4.3 Sampling methods, 1.4.4 Strengths and weaknesses of sampling methods, 1.4.5 The experimental method, 1.4.6 Experimental designs, 1.4.7 Laboratory experiments, 1.4.8 Field and natural experiments, 1.4.9 Interviews, 1.4.10 Questionnaires, 1.4.11 Case studies, 1.4.12 Observation studies, 1.4.13 Strengths and weaknesses of research methods, 1.4.14 Correlation and scatter diagrams, 1.4.15 Strengths and weaknesses of correlations, 1.4.16 Controlling extraneous variables, 1.4.17 Planning research: reliability and validity, 1.4.18 Ethical issues in research, and 1.4.19 Dealing with ethical issues. Each one has a worked solution and a mark scheme showing where the marks go.