At the end of an experimental study, a sports psychologist used a sign test to see if the reaction times of tennis players were faster, slower, or stayed the same after drinking a newly formulated energy juice compared to before they drank it.
Explain why the sports psychologist decided that the sign test was an appropriate statistical test to use on the data from this study.
121 exam-style questions on AQA A Level Psychology Inferential testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.