For a class project about a household thermostat crossover study, a student took these notes: - Twenty households used an adaptive thermostat schedule and a fixed schedule. - Each schedule lasted two weeks. - The order of schedules was randomized by household. - A one-week return-to-normal period separated the schedules. - Electricity use was recorded hourly. - Analysts adjusted comparisons for outdoor temperature. To describe the process used in a household thermostat crossover study rather than the findings, which choice best uses the notes?