A psychologist recorded how long participants continued a sustained-attention task before requesting a break. The results were grouped as shown.
| Time before requesting a break (minutes) | Frequency |
|---|---|
| 0 to under 5 | 5 |
| 5 to under 10 | 14 |
| 10 to under 15 | 9 |
| 15 to under 20 | 4 |
Identify which interval is the modal class. Calculate the sample size. Calculate the percentage of the sample represented by the modal class. Show your working.
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.