An occupational psychologist read a study on workplace environments and cognitive performance. She wanted to investigate whether placing indoor plants in offices could improve employees' concentration levels. She decided to conduct an independent groups experiment with 28 call-centre workers, comparing a group working in an office with plants against a group working in an office without plants, using a standardized concentration questionnaire that produces a score from 0 to 100.
Suggest an appropriate statistical test the psychologist could use to analyse the data. Justify your choice of 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.