Quote:
Originally Posted by BGM
If anybody has taken statistics knows you have to have a valid sample size. Sixty votes on a message board doesn't constitute a valid sample size. There are thousands of e70 owners not on this board that would affect the real conclusion of the survey.
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Valid sample size is generally >30. However, it's not about the size of the sample, it is about whether the sample population is representative of the target population (all e70 owners). I'm gonna say there is some subjective inference necessary. People on this board are more passionate about their BMWs and are into DIY things--I'm gonna assume they would make less than a normal e70 owner. However, this may not be enough to skew the data totally. I think that this could be very representative of the average e70 owner. We have people from all over the world, different ages, sexes, race, etc. It's a pretty good poll...