Researchers recruit adults aged 70 to 79 for a route-planning task and use their findings to make conclusions about people of all ages. A coder expects participants using a paper map to hesitate more than participants using written directions, so records unclear pauses as hesitations more often in the paper-map condition. Identify two different sources of bias that could affect this study.
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.