Dr Aris is conducting an investigation to compare the effectiveness of listening to binaural beats (6 Hz theta frequency) versus listening to pink noise on sleep quality. He measures participants' sleep quality using the Pittsburgh Sleep Quality Index (PSQI, where scores range from 0 to 21) after a 10-day period of nightly use.
State a fully operationalised non-directional (two-tailed) alternative hypothesis for Dr Aris's investigation.
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.