A psychologist asks members of a walking club, all aged 65 to 78 and living in the same rural town, which type of exercise they prefer. The psychologist concludes that the findings apply to all adults in the UK.
Explain which type of validity is threatened by the psychologist's conclusion. Suggest one change to the sample that would reduce this problem.
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.