In a laboratory experiment investigating the effectiveness of a new type of blue-light filtering lens on reducing eye strain during prolonged screen work, researchers compared an experimental group wearing the blue-light filtering glasses with a control group wearing identical-looking glasses with standard clear lenses.
The researchers were concerned that the outcome measures—including self-reported visual fatigue and scores on an attention-tracking computer task—might be biased by both demand characteristics and investigator effects.
Explain how the researchers could design or conduct this study to eliminate or reduce both demand characteristics and investigator effects.
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.
