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Here is the article on Bloomberg: http://www.bloomberg.com/apps/news?pid=20601204&sid=aG2U...

Sample size is the kid + his friends.

If you just choose a child at random, you are likely to get an average child. There isn't just one average kid, there are MANY, and a few weird ones.

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This kid is from a certain social background and is likely to associate with kids from a similar social background, unless he is a networker par excellence and has contacts all over the globe with teenagers from every income level and education level.

There are untold variations on that, and each of those subgroups has their own 'averages', this kid is at best - and I'm not saying that he is, just leaving open the possibility - in the middle of his own subgroup.

Of course, but these are a bunch of middle-aged analysts we're talking about. Actually getting some first-hand information from teenagers is going to be a huge step up regardless of statistical bias.

any suggestions for items in a questionnaire? :)

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