A psychologist records the time taken by 12 participants to complete a route-learning task. The results are shown below.
| Time taken (seconds) | Frequency |
|---|---|
| 22 | 1 |
| 24 | 2 |
| 26 | 5 |
| 28 | 2 |
| 30 | 1 |
| 52 | 1 |
Calculate the mean time taken to complete the task.
A researcher claims that the mean is the best measure of typical performance for these participants. Evaluate this claim using the frequency table and the other measures of central tendency.
One participant was briefly interrupted during the 52-second attempt. The psychologist removes this result. Predict how the mean, median and mode will compare after the result is removed, and explain what this would indicate about the distribution.
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.