You are not currently logged in. Please create an account or log in to view the full course. Classic View Psychology A Level Edexcel A Level Psychology (9PS0) Criminological Psychology 6.2 Methods 6.2.2 Sample Selection and Techniques Classic View 6.2.2 Sample Selection and Techniques RESEARCH METHODS – BUILDING AN EXPERIMENT Samples and Populations Dr Eoin O'Sullivan, University of St Andrews