Dr. Vance conducted an investigation to evaluate the impact of a smartphone application that sends daily mindfulness prompts on the occupational stress of intensive care unit (ICU) nurses. He recorded the self-reported stress levels of 30 ICU nurses at the end of a two-week period during which they used the app daily. He did not measure their stress levels prior to introducing the app, and there was no control group.
Explain one improvement Dr. Vance could make to the design of his study.
57 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.