A psychologist records the time taken by a large group of adults to complete a simple task. The results form a normal distribution.
Which statement about these completion times is correct?
The times form a symmetrical pattern with peaks at both extremes.
The mean, median and mode have different values.
The times are spread evenly, with the same number at every value.
The times form a symmetrical pattern with one peak in the middle.
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.