from The Open University
Alternatively you can skip the navigation by pressing 'Enter'.
The world’s busiest railway 2015 – Mumbai Railway: Episode 4Saturday, 3rd October 2015 16:55 - BBC TwoThis final episode considers the challenges faced by the historic Chhatrapati Shivaji Terminus - and asks what the... Read more: The world’s busiest railway 2015 – Mumbai Railway: Episode 4
The Bottom Line: Autumn 2015: Art and the Business of TasteSaturday, 3rd October 2015 17:30 - BBC Radio 4
The Great British Year: WinterMonday, 5th October 2015 21:00 - BBC Four
Canals: The Making of a Nation: HeritageTuesday, 6th October 2015 20:00 - BBC Four
The Bottom Line: Autumn 2015: Art and the Business of TasteAvailable for over a yearHow do you value something like a painting? What makes one artist worth more than another? Who decides what is in... Read more: The Bottom Line: Autumn 2015: Art and the Business of Taste
BBC Inside Science: Preserving global diversity: Kew specialAvailable for over a year
Countdown To Life: The Extraordinary Making Of You: The Final PushAvailable until Saturday, 31st October 2015 00:15
The ascent of woman: PowerAvailable until Friday, 30th October 2015 02:30
Who will lead Britain out of the European UnionPerhaps it's not surprising that campaigners against the European Union don't want to work... Read more: Who will lead Britain out of the European Union
OpenLearn Live: 2nd October 2015Two mathematicians who threw shapes; then more free learning through the day. Read more: OpenLearn Live: 2nd October 2015
Learning to teachThis free course, which comprises four study units, is aimed at people who are considering... Try: Learning to teach now
English: skills for learningThis course is for anybody who is thinking of studying for a university degree and would like to... Try: English: skills for learning now
Exploring data: Graphs and numerical summaries
This Unit will introduce you to a number of ways of representing data graphically and...
This Unit 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.
Studying this unit will help you work towards the following learning outcomes:
- Know and be able to 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.
- Be aware that data can have a pattern which may be represented graphically.
- Be aware that the standard deviation and the interquartile range are measures of the dispersion in a data set.
- Be aware that the median and the interquartile range are more resistant measures than are the
mean and the standard deviation.
- Acquire the skill of gaining an overall 'feel' for data and the way they are distributed by constructing appropriate graphical displays.
- Acquire the skill of describing data sets on the basis of graphical displays and numerical summaries.
- Acquire the skill of calculating summary measures such as the median, the upper and lower quartiles, the mean, the standard deviation and the variance, using a calculator.
- Current section: Introduction
- Learning outcomes
- 1 0 Introducing data
- 1.1 Data and questions
- 2.3 Pie charts and bar charts
- 2.3.1 Introduction
- 1.3.2: Pie charts: surgical removal of tattoos
- 1.2.3 Pie charts: Nuclear power stations
- 1.2.4 Bar charts: nuclear power stations
- 1.2.5 Bar charts: Surgical removal of tattoos
- 1.2.6 Problems with graphics
- 1.2.7 Problems with graphics: USA workforce
- 1.2.8 Problems with graphics: nuclear power stations
- 1.2.9 Pie charts and bar charts: summary
- 3 Histograms and scatterplots
- 4: Numerical summaries
- 1.4.1 Introduction
- 1.4.2 Measures of location
- 4.3: The median
- 1.4.6: Measures of dispersion
- 4.7: Quartiles and the interquartile range
- 1.4.8 The standard deviation
- 1.4.9 Sample variance
- 1.4.10 A note on accuracy
- 4.11: Symmetry and skewness
- 4.12: Numerical summaries: summary
- 5: Summary
Study this free course
Enrol to access the full course, get recognition for the skills you learn and track your progress. Make your learning visible!
Exploring data: graphs and numerical summaries
This unit 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.
This free course is an adapted extract from the Open University course M248
Copyright & revisions
Originally published: Wednesday, 27th July 2011
- 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 conditions. Full details can be found in the Acknowledgements section.
- This site has Copy Reuse Tracking enabled - see our FAQs for more information.
If you enjoyed this, why not follow a feed to find out when we have new things like it? Choose an RSS feed from the list below. (Don't know what to do with RSS feeds?)
Remember, you can also make your own, personal feed by combining tags from around OpenLearn.