In a message dated 7/3/2001 2:35:34 PM US Eastern Standard Time,
[log in to unmask] writes:

<< Many people would say something
 like 25. It's entirely arbitrary and no theory can tell you how many are
 enough. 25 comes from the reasoning that, under most circumstances, 25
 samples will make the sample s.dev. a somewhat reliable estimate of the
 population s.dev. >>

I agree with your reasoning.  We always use 30, for very much the same logic.

Jon Moore

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