A psychologist asks 30 teenagers to record how many minutes they spend on a screen in the hour before bed and how many minutes it takes them to fall asleep, using a sleep app.
State a directional alternative hypothesis for this study.
182 exam-style questions on OCR GCSE Psychology 7.1 Planning Research, covering 7.1.1 Hypotheses, 7.1.2 Variables, 7.1.3 Experimental Designs, 7.1.4 Populations and Sampling, 7.1.5 Ethical issues, and 7.1.6 Dealing with ethical issues and BPS Code. Each one has a worked solution and a mark scheme showing where the marks go.