Representation of data

What the syllabus asks of you

• select a suitable way of presenting raw statistical data, and discuss advantages and/ or disadvantages that particular representations may have
• draw and interpret stem-and-leaf diagrams, box-and-whisker plots, histograms and cumulative frequency graphs
• understand and use different measures of central tendency (mean, median, mode) and variation (range, interquartile range, standard deviation)
• use a cumulative frequency graph
• calculate and use the mean and standard deviation of a set of data (including grouped data) either from the data itself or from given totals Σx and Σx², or coded totals Σ(x − a) and Σ(x − a)², and use such totals in solving problems which may involve up to two data sets.