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Topic: [ap-stat] 30 and the Central Limit Theorem
Replies: 6   Last Post: Mar 23, 2012 7:21 PM

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Posts: 1,293
Registered: 5/17/09
RE: [ap-stat] 30 and the Central Limit Theorem
Posted: Mar 22, 2012 9:32 PM
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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):787-793.

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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