A previous investigation compared pupils' comprehension after they read the same passage either with relevant illustrations or without illustrations.
| Condition | Mean comprehension score out of 12 |
|---|---|
| Passage with relevant illustrations | 9.1 |
| Passage without illustrations | 7.4 |
A psychologist plans a new investigation using the same two conditions and will record each pupil's score on a 12-mark comprehension test.
Using the previous finding, explain whether the psychologist should use a directional or a non-directional hypothesis for the new investigation.
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.