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# Standard Deviation

What is Standard Deviation? What does it tell us about the data?
by

## Andrew Lanning

on 17 April 2010

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#### Transcript of Standard Deviation

Standard Deviation What does 'Deviation' mean? wordnetweb.princeton.edu/perl/webwn markedly different from an accepted norm The standard deviation is defined as the average amount
by which scores in a distribution differ from the mean. http://www.une.edu.au/WebStat/unit_materials/
c4_descriptive_statistics/standard_deviation.htm 68% of data will be within ±1 standard deviation of the mean. If the mean height = 165cm,
and SD = 10 cm.
It means the majority of girls are.... Find the mean and standard deviation of the places
of the 10 BGGS cross country runners who placed:

3 5 10 12 15 16 20 22 24 27

Do you think the BBGS runners are very spread, if a total
of 100 girls ran in the race? On Calculator:
Sx = sample SD (ie. of 20 light bulbs)
σx = Population SD (ie. of all light bulbs) Practice:
Ex 10C, Page 505
Q2, 3, 6 http://en.wikipedia.org/wiki/Standard_deviation
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