Re: The only reason I post this on Flame is because
As an aside, that reminds me that "telephone bias" used to be a problem when taking random surveys. Designers had to factor in people not answering the call or hanging up. The biggest flaw was- not every household owned a phone.
On the flipside today people have been ditching their landlines for cellphones and as far as i know, there isn't a directory for cellphone numbers.
So now a phone survey is likely to overlook more than a 1/4 of phone users, probably in a demographic all their own.