A study compares proofreading while seated with proofreading while standing. The seated participants receive a short passage and five minutes to check it. The standing participants receive a longer passage and two minutes to check it. The seated participants identify a greater proportion of the errors.
Explain why this result does not establish that sitting caused better proofreading.
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.