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standard deviation question on a concept

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by amyhussein » Wed Mar 13, 2013 10:42 am
if we have 2 sets with the same number of items in them. if both have equal standard deviations. will both groups be equal?
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by Brent@GMATPrepNow » Wed Mar 13, 2013 10:49 am
amyhussein wrote:if we have 2 sets with the same number of items in them. if both have equal standard deviations. will both groups be equal?
The quick answer: No, the 2 sets need not be equal.

For example {1,2,3} and {7,8,9} have the same standard deviation, but the sets are not equal.

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