A researcher investigated whether the type of instructions affected how quickly adults completed a wooden construction puzzle. The same puzzle and timekeeping method were used in both conditions.
| Type of instructions | Participant numbers | Mean completion time (seconds) |
|---|---|---|
| Picture instructions | 1, 2, 3, 4, 5, 6 | 74 |
| Written instructions | 7, 8, 9, 10, 11, 12 | 91 |
Describe how the information in the table shows that the researcher used an independent measures design.
Using the data in the table, explain why the difference in mean completion times may not have been caused by the type of instructions.
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.