A researcher records a 20-minute discussion between adults planning a community event. The recording is divided into five four-minute intervals.
Two observers watch the same recording independently. They use a coding sheet that defines an interruption as "starting to speak while another person is still speaking". The observers have not practised applying this definition to shared examples.
| Interval (minutes) | Observer A's tally | Observer B's tally |
|---|---|---|
| 0 to 4 | 4 | 4 |
| 4 to 8 | 6 | 5 |
| 8 to 12 | 3 | 3 |
| 12 to 16 | 7 | 10 |
| 16 to 20 | 5 | 5 |
Evaluate the reliability of this observation. Use the information and data provided in your answer.
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.