A sleep scientist conducted an investigation to determine whether wearing blue-light filtering glasses for two hours before bedtime reduces sleep onset latency (the time taken to fall asleep) compared to wearing standard clear-lens glasses. Sleep onset latency was recorded automatically in minutes using a wearable consumer EEG headband tracker.
Outline what is meant by objectivity in scientific research and explain how it applies to this investigation into sleep onset latency.
47 exam-style questions on OCR A Level Psychology How science works. Each one has a worked solution and a mark scheme showing where the marks go.