A health psychologist conducted an initial study into the effects of a new digital wellbeing application on stress. They now plan to conduct a follow-up laboratory experiment to investigate whether the daily duration of using the application (15 minutes per day versus 45 minutes per day) affects participants' physiological stress levels, measured by heart rate variability (HRV) scores.
Write a suitable directional (one-tailed) experimental hypothesis for this follow-up study.
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.