A frequency table groups participants' sleep duration into four classes: 5 to under 6 hours (frequency 2), 6 to under 7 hours (5), 7 to under 8 hours (9) and 8 to under 9 hours (4). Identify the modal class, calculate the total number of participants and calculate the percentage of participants in the modal class. 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.