A psychologist compares the recall of two groups of pupils.
| Sleep group | Number of pupils | Total words recalled |
|---|---|---|
| Under 6 hours | 8 | 104 |
| 8 hours or more | 8 | 144 |
Calculate the mean number of words recalled by each group and the difference between the two means.
72 exam-style questions on Edexcel GCSE Psychology 11.2 Data analysis, covering 11.2.1 Arithmetic and numerical computation, 11.2.2 Descriptive statistics, 11.2.3 Tables, charts and graphs, 11.2.4 Primary and secondary data, and 11.2.5 Qualitative and quantitative data. Each one has a worked solution and a mark scheme showing where the marks go.