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From satellites to the London Olympics, all in one career

A favourite from the archive...
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Discover why the number 6174 is so mysterious.

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September 2008
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Simpson's Paradox

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Did you know that you can't average averages? Or that Paris is rainier than London ... but it rains more in London than in Paris? Andrew Stickland explores the dangers that face the unwary when using a single number to summarise complex data.

Tags: statistics : probability : Average : correlation : paradox : Simpson's Paradox : mean : median : outlier