A psychologist investigates how accurately employees remember spoken safety instructions. The target population is all 1,200 employees at a distribution centre. The psychologist uses a random number generator to select 30 employees from a complete staff list, and all 30 take part.
| Work shift | Number in target population | Number in sample |
|---|---|---|
| Early | 600 | 21 |
| Late | 360 | 8 |
| Overnight | 240 | 1 |
| Total | 1,200 | 30 |
The psychologist decides to use the findings from this sample to make a recommendation for employees on all three shifts.
Evaluate the psychologist's sampling decision. You must compare the proportions in the sample with those in the target population as part of your evaluation.
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.