>Why are you only considering those who watch and those who don't? The
>question asked refers to the *average hours/week* as related to IQ level.
The problem here is that the you can't treat *average hours of TV watched/week* as independent of lots of other variables that impact on IQ. For instance from memory you'll find that children from families with a higher socio-economic status watch less TV. Of course you could control for a factor like socio-economic status, but you'll still be left with the problem that within any relatively homogeneous group the reasons why more or less TV is watched is likely to have various impacts on the child that affect IQ *independent* of how many hours of TV are watched.
I am not saying you couldn't do such a naturalistic study (and certainly not that IQ and TV aren't related), just that it would be hard to get clear results.
Patrick Wilken http://www.csse.monash.edu.au/~patrickw/ Editor: PSYCHE: An International Journal of Research on Consciousness Secretary: The Association for the Scientific Study of Consciousness http://psyche.cs.monash.edu.au/ http://www.phil.vt.edu/ASSC/