A researcher observes 20 adults completing an unfamiliar route-planning task. The researcher records how many times each adult asks for an instruction to be repeated.
| Participant | Number of requests |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 3 |
| 4 | 0 |
| 5 | 2 |
| 6 | 4 |
| 7 | 1 |
| 8 | 2 |
| 9 | 3 |
| 10 | 2 |
| 11 | 0 |
| 12 | 3 |
| 13 | 1 |
| 14 | 2 |
| 15 | 3 |
| 16 | 2 |
| 17 | 1 |
| 18 | 0 |
| 19 | 3 |
| 20 | 2 |
The researcher produces this summary.
| Number of requests | Frequency |
|---|---|
| 0 | 3 |
| 1 | 5 |
| 2 | 7 |
| 3 | 4 |
| 4 | 1 |
| Total | 20 |
The total row matches the 20 observations, but the summary still contains errors. Explain why this total does not prove that the table is accurate. Give both corrections needed to the frequency column.
The researcher claims that more than 60% of the adults asked for an instruction to be repeated at least twice. Calculate the percentage of adults who did this. Explain whether the researcher's claim is supported.
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.