A researcher wanted to conduct a follow-up study to investigate whether participants categorized as 'high-caffeine consumers' differed from 'low-caffeine consumers' in their self-reported anxiety scores (measured on a scale of 1 to 10). In order to do this, she needed to select an appropriate statistical test to conduct on her data.
Identify an appropriate statistical test that the researcher could use and justify your choice.
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.