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RE: [apstat] 30 and the Central Limit Theorem
Posted:
Mar 22, 2012 9:32 PM


Bob and All 
> There are some mathematical and historical reasons to believe that > when n > 30, this is a safe point at which to believe that a sample > mean is becoming approximately normal.
Found the article I was thinking of. It wasn't written by Cochran, but refers to Cochran's writing...
The article is: Sugden, R. A., et al. (2002). Cochran's Rule for Simple Random Sampling. J of the Royal Statistical Society, Series B, Statistical Methodology. 62(4):787793.
They reference Cochran, Sampling Techniques, p42. (I only have my paperback copy of ST at home, but the page# checks out there.)
 Chris
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