An environmental psychologist investigates whether exposure to biophilic design (plants and natural light) in workspace environments reduces physiological stress. She measures salivary cortisol levels (in nanomoles per litre, nmol/L) of employees after working a six-hour shift. One group of employees worked in an office with biophilic design elements, while a separate group worked in a standard office with no natural elements. The biophilic office group had a mean cortisol level of 4.2 nmol/L, whereas the standard office group had a mean cortisol level of 7.8 nmol/L.
State an appropriate inferential statistical test that the psychologist could use to analyse her data.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.