Dr. Aris investigated the impact of a newly developed mindfulness application on individuals' self-reported sleep quality. He asked participants to rate their sleep quality over a seven-day period on a scale of 1 (extremely poor) to 10 (excellent). One group of 15 participants used the mindfulness application nightly before bed, resulting in a mean rating score of 8.1. A second, independent group of 15 participants read a paperback book nightly before bed, resulting in a mean rating score of 5.6.
State which non-parametric statistical test Dr. Aris should use to analyse his data.
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.