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.
Practise AQA A Level Psychology Research methods with exam-style questions for A Level Psychology. 100 questions covering Experimental method, Observational techniques, Self-report techniques, Correlations, Content analysis (A-level only), Case studies (A-level only), Scientific processes, Data handling and analysis, and Inferential testing (A-level only), matched to the AQA A Level Psychology (7182) 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.