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# Some Tips on Standard Deviation Sums particularly DS 1) If

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Joined: 01 Oct 2006
Posts: 495
Some Tips on Standard Deviation Sums particularly DS 1) If [#permalink]

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29 Jan 2007, 10:46
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Some Tips on Standard Deviation Sums particularly DS
1) If you add or subtract a particular constant from all the terms the sd deviation remains same and the mean is either increased or decreased by constant
2) If you multiply all terms by x then SD =x times old SD and mean = x times old mean.
3) For comparing the SD for two sets any information about mean ,median,mode and range are insufficient unless you can determine the individual terms from the given data.

Hope these help

Cheers
Yogesh
Some Tips on Standard Deviation Sums particularly DS 1) If   [#permalink] 29 Jan 2007, 10:46
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