An environmental scientist wants to investigate whether the noise levels (measured in decibels, dB) in a local nature reserve differ before and after a nearby bypass road is opened. She measures the peak noise levels at 10 specific locations within the reserve on a weekday afternoon before the opening, and again on a weekday afternoon after the opening. The differences in noise levels cannot be assumed to be normally distributed.
Identify an appropriate statistical test that the scientist could use and justify your choice.
Practise AQA A Level Psychology Inferential testing (A-level only) with exam-style questions for A Level Psychology. 123 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.
