A psychologist from Culture A wrote ten short scenarios about everyday situations in Culture A, each with three possible responses. Participants from Culture A and from Culture B chose the response they would give in each scenario. Each chosen response was rated from 1 (very impolite) to 5 (very polite) by two raters from Culture A and, separately, by two raters from Culture B. The mean ratings are shown below.
| Participants | Mean rating from Culture A raters | Mean rating from Culture B raters |
|---|---|---|
| Culture A | 4.2 | 3.4 |
| Culture B | 3.1 | 4.3 |
Using only the ratings from the Culture A raters, the psychologist concludes that people from Culture B are less polite than people from Culture A.
Use the information in the table to explain why the psychologist's conclusion is not justified.
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.