An occupational psychologist conducted a study to investigate whether listening to a specific frequency of binaural beats affects the attention span of air traffic controllers. The controllers completed a standardized concentration test before listening to the audio track, and then completed an equivalent test immediately after listening to it. The psychologist analyzed the comparison using a sign test.
Explain why the 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.