Researchers investigate patience by asking 30 adults to wait in a mock queue in a research room. Everyone is told that their behaviour is being filmed. Two trained observers work separately and record whether each person leaves the queue before eight minutes have passed. Their classifications agree for 29 of the 30 adults.
Evaluate the quality of the observational evidence.
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.