A team of chronobiologists wants to investigate whether blocking short-wavelength (blue) light in the evening can help people fall asleep faster. They plan to use an independent measures design to compare the effects of wearing blue-light filtering glasses against wearing clear control glasses (which do not filter blue light) for two hours before bedtime.
Write a one-tailed alternative (directional) hypothesis for this study.
201 exam-style questions on OCR A Level Psychology Planning and conducting research. Each one has a worked solution and a mark scheme showing where the marks go.