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.
Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
