A researcher investigates anxiety using a questionnaire completed by pupils in one secondary school. The questionnaire asks about sleep and worry. The researcher intends to use the findings to draw conclusions about anxiety in teenagers across the UK.
Explain two threats to validity in 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.