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4.7: Quartiles and the interquartile range

The first alternative measure of dispersion we shall discuss is the interquartile range: this is the difference between summary measures known as the lower and upper quartiles. The quartiles are simple in concept: if the median is regarded as the middle data point, so that it splits the data in half, the quartiles similarly split the data into quarters. This is, of course, an over-simplification. With an even number of data points, the median is defined to be the average of the middle two: de
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5.6 Younger Cover

The Younger Cover can be found covering a large part of England, and to a lesser extent, north-east Ireland, south-west Scotland, Arran, Mull, and the north of Skye. From the Ten Mile Maps and Author(s): The Open University

2 Liz Shepherd and Jan Hurst

Figure 1
Liz Shepherd

2.2 The effect of technology on productivity

In each industrial revolution, new inventions radically changed the way that production and distribution were organised, and often led to large and rapid increases in the efficiency of production. The rise of electricity, for example, allowed US productivity to increase in the manufacturing sector (as opposed to the agricultural or service sector) by more than 5 per cent per annum throughout the 1920s.

Let us pause a moment and consider what this means. The term productivity refe
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Sheyann Webb
Eight-year-old Sheyann Webb was among the youngest activists to demonstrate during the Civil Rights movement. In this interview, Webb recalls her decision to participate in the 1965 voting-rights march from Selma, Alabama, the resistance she encountered from her parents, and the violent force used by local officials to stop the march. (5:08)
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1.2.2 Boundaries of difference

One of the things that language does is define and give a name to differences between people – to delineate the boundaries that separate them. In the mental health field, the ‘mad’ are at one end of the social divide that separates the ‘normal’ from the ‘abnormal’. They are ‘the other’, a point made in the article by Perkins (above): ‘To be mad is to be defined as “other”’.

This is a recurring theme in the mental health field. In the following passage Abina Par
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3.7 Memory and Understanding

Memory and understanding

Exams are rarely tests of memory, but much more to do with the selection, presentation and interpretation of materials. When you have understood what you have read, you can think about it and use it. Nonetheless, you may still be concerned about your ability to
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The Crusades: Crescent and the Cross: The Legacy
A look at the history of the Crusades. An overview of the continuing battles between Muslim and Christians.

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How Sunburns Work - How Stuff Works
Why do some people tan, and others burn? Learn why skin works the way that it does. Explains what happens after your skin gets too much sun. Grades 5-12. (00:58)
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Learn French - French Color Vocabulary
Each word is introduced in English and French. This is a great way to study new vocabulary words that will build up your proficiency in French. (02:44)
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1.4.3 Structures that both enable and constrain

Life within a society is made possible by structures. They operate at many levels, from the details of daily life (e.g. the routines of getting up in the morning, or the ritual greetings we use when we meet people) to the broader organisation of society (e.g. the channels through which mass media ‘news’ is generated, or the rules under which benefit payments are made). Even the language through which I am communicating now is a structured system of written symbols. But structures not only
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Leonardo da Vinci: Legacy
While Leonardo da Vinci is well-remembered for his paintings, it was perhaps his notebooks that have the greatest impact on the modern world. In this video clip, learn more about the life Leonardo da Vinci. (4:55) 
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Understanding digital video metadata workflow
Efficiently track, search, and organize assets as they travel between Adobe Production Premium applications
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Marvin Rosen from WPRB| 04/02/10
Volunteer DJ Marvin Rosen, host of two shows on Princeton's university station WPRB, joins interviewer Susan Wallner for a podcast about the reinvention of new, accessible music from classically inspired traditions. His show "Classical Discoveries" aims to show people "the beauty of contemporary music" and to "illustrate that music brings us close. The show runs on Wednesdays.
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The Wright Brothers
The story of the Wright Brothers and what they did after the first flight are touched upon in this two minute video. Basic material, but might be of interest to students how think that these inventors disappeared after their great deed.
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Teenager Overcomes Reading Problem
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Sacred Calendars - Advent with Alison Milbank
Dr Alison Milbank discusses the period running up to Christmas -- known to Christians as 'Advent'-- and what this time means to them, and how it is celebrated.
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Nobel Laureate Charles H. Townes - Rennaisance Man
A celebration of the life and work of Dr. Charles H. Townes on the ocassion of his 95th birthday http://www.iibhb.org
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2 Discrimination in the labour market: introduction

Discrimination can manifest itself in all aspects of life. It may be evident in the type and location of housing available to certain groups, in their access to quality education and health care or how they are treated in the labour market. We will focus on the last of these considerations and, in particular, why the labour market status of some groups of workers is significantly worse than that for the population at large. This does not mean that discrimination in the labour market is a more
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Mitt Romney; Missile Study: The Week at Duke {in 60 Seconds}
Welcome to the Week at Duke University in 60 Seconds. Governor Mitt Romney spoke at Duke last week. He talked about his run for president in 2012, foreign policy and even his upcoming charity boxing match with Evander Holyfield. You can see the entire talk online. http://sanford.duke.edu/articles/mitt-romney-speaks-duke A new Duke study reports that 9 percent of adults in the U.S. who have a history of impulsive angry behavior also have access to guns. The study suggests that to prevent gun vi
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