Standard Deviation Question

[technicolor]

Hi,

In what situations should you use the sample standard deviation equation and in what situations should you use the population standard deviation equation?

Thanks.

[mayday]

Try this page:

http://standard-deviation.appspot.com/

[vwxy292]

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[lovingnet5]

the standard deviation measures the spread of the data about the mean value. It is useful in comparing sets of data which may have the same mean but a different range. For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.