A sports scientist wants to investigate whether drinking beetroot juice improves athletic endurance compared to a placebo. Thirty-six long-distance runners are recruited. Eighteen runners are randomly selected to consume 150 ml of beetroot juice before a treadmill test, while the other eighteen runners consume 150 ml of a purple-coloured placebo drink before completing the same treadmill test.
Identify and briefly describe the experimental design used in this study.
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.