Estimating variance of subsample given only variance of orignal

From: mrmaxx2@xxxxxxxxx
Date: Thu, 22 May 2008 06:17:37 -0700 (PDT)

Is there any estimate for a variance of the subset of N-samples? Say I
have 1000 samples and I only know the mean and variance, what would
the variance of the 100 sub samples be?
.

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