An aerospace engineering firm is evaluating the fuel efficiency of two newly developed sustainable aviation fuels (SAF-Alpha and SAF-Beta) for short-haul commercial flights. To ensure a fair test, the firm matches pairs of twin-engine aircraft based on airframe age, engine model, and typical flight route. One aircraft in each pair is fueled with SAF-Alpha, while the other is fueled with SAF-Beta. The average fuel consumption (in kilograms per passenger-kilometre) is recorded over a series of test flights.
Explain what is meant by a matched pairs design.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.