This free course, Exploring data: graphs and numerical summaries, will introduce you to a number of ways of representing data graphically and of summarising data numerically. You will learn the uses for pie charts, bar charts, histograms and scatterplots. You will also be introduced to various ways of summarising data and methods for assessing location and dispersion.
Course learning outcomes
After studying this course, you should be able to:
understand and use standard symbols and notation: for the pth value in a data set when the values are written in order, the sample lower and upper quartiles and the sample median, the sample mean and the standard deviation
understand that data can have a pattern which may be represented graphically
understand that the standard deviation and the interquartile range are measures of the dispersion in a data set
understand that the median and the interquartile range are more resistant measures than are the mean and the standard deviation
identify an overall 'feel' for data and the way it is distributed by constructing appropriate graphical displays.
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Creative commons: The Open University is proud to release this free course under a Creative Commons licence.
However, any third-party materials featured within it are used with permission and are not ours to give away. These
materials are not subject to the Creative Commons licence. See terms and conditions377 and our FAQs378.
Full copyright details can be found in the Acknowledgements section of each week.
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