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From: wvenable@spam.ua.oz (Bill Venables)
Newsgroups: comp.edu,sci.research
Subject: Re: <<< I.S. SURVEY II >>>
Keywords: Thanks for your help.
Message-ID: <345@spam.ua.oz>
Date: 20 Jul 90 00:48:21 GMT
References: <5533@uceng.UC.EDU>
Organization: Statistics, Pure and Applied Maths, University of Adelaide
Lines: 12

In article <5533@uceng.UC.EDU> ddahmer@uceng.UC.EDU (Hello World!) writes:
>... I am posting this again as I need a larger number of responses to
>go by for statistical purposes. (At least 30 in a sample to model a
>population, etc.)  ...

I feel obliged to sound a warning of the dangers of drawing inferences
from self-selected rather than random samples.  Sample size by itself
is no safeguard against wildy erroneous conclusions.

-- 
  Bill Venables, Dept. Statistics,        | Email:   wvenable@spam.ua.oz.au
  Univ. of Adelaide,  South Australia.    | Phone:           +61 8 228 5412