Elena conducted an investigation into the effects of blue-light filtering glasses on sleep quality. She recruited her participants from a large technology company using a volunteer sampling technique.
Elena asked Group 1 to wear blue-light filtering glasses for four hours before bed, while Group 2 wore plain clear-lens glasses. She then used a standardised sleep questionnaire to measure their sleep quality.
Describe how Elena may have gathered her participants using a volunteer sampling technique.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.