In order to analyse the difference in the number of bystanders who offered assistance (helped vs did not help) across two different environmental conditions (alone vs in a group of passive bystanders), the researchers used a Chi-squared test.
Apart from reference to the level of measurement, give two reasons why the researchers used the Chi-squared test.
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.