A sports psychologist investigated whether there is a difference in the self-reported focus levels (measured on a scale of 1 to 12) between athletes training under high-altitude conditions and those training at sea level.
State two reasons why a Mann-Whitney U test would be an appropriate statistical test to analyse the data from this study.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.