Observers recorded cooperative behaviour during break time at a primary school. The mean number of cooperative acts recorded per break was 8 before a playground initiative and 14 after six weeks.
Calculate the percentage increase in the mean number of cooperative acts. Show your working.
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.