From: Liz Colonna
To: Teacher2Teacher Service
Date: May 01, 2000 at 14:38:22
Subject: Statistics

When using confidence intervals to estimate the population mean for large
samples and small samples, the cut-off number for sample size is n=30 for
large samples.  What was the process that mathematicians used to come up
with 30 as the cut-off point?  My students thought that a large sample
would be in the hundreds, not a number as small as 30.  Thanks!

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