An environmental physiologist is investigating the relationship between air pollution and respiratory health in urban areas. The physiologist believes that higher levels of ambient fine particulate matter (PM2.5PM_{2.5}PM2.5 concentration) are associated with lower peak expiratory flow rates (PEFR) in adult residents. To investigate this, the researcher plans to conduct a study using a correlational research design where they measure PM2.5PM_{2.5}PM2.5 levels (in μg/m3\mu\text{g/m}^3μg/m3) and the peak expiratory flow rate (in L/min) of a sample of residents.
Write a one-tailed directional alternative hypothesis for this study.
201 exam-style questions on OCR A Level Psychology Planning and conducting research. Each one has a worked solution and a mark scheme showing where the marks go.