Absolutely, the sample has to be completely random (I used the word
representative - perhaps random would have been better!)

The point I was making was that 31 out of 2000, 31 out of 2 million
doesn't matter - if the 31 is random.

David

>-----Original Message-----
>From: [EMAIL PROTECTED] 
>[mailto:[EMAIL PROTECTED]] On Behalf Of 
>Peter Rundle
>Sent: Friday, 21 June 2002 5:00 PM
>To: [EMAIL PROTECTED]
>Subject: Re: [aus-soaring] RPL results
>
>
>
>
>David Conway wrote:
>
>>Don't call the kettle black (if you are a pot)!
>>
>[lots of good rules about statistics snipped]
>
>David, what happens to your rules about statistical samples if 
>the sample is not random?  After all in this straw poll the 
>voters selected themselves.
>
>No serious question, isn't the fact that the voting isn't  a 
>random sample make those extrapolations invalid?
>
>rgds
>
>Pete
>
>
>
>
>
>
>
>
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