Participants in two memory-practice sessions choose whether they would prefer to practise in a quiet room. The results are shown below.
| Session | Number of participants | Percentage choosing a quiet room |
|---|---|---|
| A | 60 | 40% |
| B | 150 | 24% |
Explain how comparing pie charts of these results could give a misleading impression.
173 exam-style questions on OCR GCSE Psychology 7.3 Analysing Research, covering 7.3.1 Types of Data, 7.3.2 Measures of central tendency, 7.3.3 Other descriptive statistics, 7.3.4 Tables, Charts and Graphs, 7.3.5 Reliability, 7.3.6 Validity and effects on validity, and 7.3.7 Sources of bias. Each one has a worked solution and a mark scheme showing where the marks go.