An environmental scientist wants to assess the ecological health of 40 local wetland sites. They design a new 15-item 'Wetland Quality Index' (WQI) observational scoring sheet to measure habitat degradation. The maximum possible score on the WQI is 60. In the scientist's initial pilot study, the lowest score recorded was 14 and the highest was 52.
In a separate part of the study, the scientist also measured the mean dissolved oxygen level (in mg/L) at each of the 40 sites.
What is meant by 'reliability'? Explain how the environmental scientist could assess the reliability of the Wetland Quality Index (WQI) scoring sheet.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.