A school has piloted a 12-item questionnaire about pupils' confidence when working with unfamiliar classmates. The items have been split into two sets of six, set A and set B. The total scores for four pupils are shown below.
| Pupil | Set A total | Set B total |
|---|---|---|
| 1 | 22 | 24 |
| 2 | 17 | 16 |
| 3 | 20 | 21 |
| 4 | 13 | 15 |
State one way the 12 items could have been split into set A and set B.
Describe what the pattern of scores suggests about the internal reliability of the questionnaire.
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.