A psychologist measuring reaction times (in milliseconds) notices that one participant was extremely distracted, resulting in an exceptionally high reaction time compared to the rest of the cohort.
Explain why the psychologist should use the standard deviation rather than the range as a measure of dispersion in this situation.
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, matched to the Edexcel A Level Psychology (9PS0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.