Quote:
Originally Posted by whitearrow
More like 2/3 of Kindle owners *who post to the Amazon boards* are over 40. I don't think that's a statistically random sample that you can generalize to the pool of Kindle owners at large.
|
Just because it's not a random sample doesn't mean it's useless. First, you'd have to posit a good theory why the self-selected website responses would be different from random. Then, you'd have to show how that difference would be statistically signifigant. And even then, a large difference wouldn't invalidate broad conclusions. We can be reasonably confident that it's not 80% under the age of 40, for example.