Cognitive psychologists investigated the impact of distraction on task performance. They measured the number of errors made on a standardized attention task by two groups of participants: a 'High Distraction' group (who performed the task with background noise) and a 'Low Distraction' group (who performed the task in silence). The raw error scores for the first fifteen participants in each group who completed the study are presented in the tables below.
Table 1: Number of errors made on an attention task by participants in High Distraction and Low Distraction groups
| High Distraction | Low Distraction |
|---|---|
| 10 | 3 |
| 7 | 4 |
| 10 | 5 |
| 8 | 2 |
| 6 | 4 |
| 10 | 3 |
| 7 | 5 |
| 10 | 4 |
| 8 | 3 |
| 6 | 2 |
| 10 | 5 |
| 7 | 4 |
| 9 | 3 |
| 9 | 4 |
| 7 | 2 |
A partly completed table of measures of central tendency for the data collected in Table 1 is presented below.
| Measures of central tendency for the error scores of the High Distraction and Low Distraction groups | ||
|---|---|---|
| High Distraction | Low Distraction | |
| mean | 3.5 | |
| median | 8.0 | |
| mode | 10.0 |
Calculate the mean error score for the High Distraction group. Write your answer to two significant figures.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.