When I say rejecting a hypothesis, I mean it in the statistical sense. For example, if you wanted to reject Watson's hypothesis that black employees are less clever then you would have to perform surveys, tests etc.
Why? He didn't.
I don't put much stock in that assertion, because it's like saying employers think _____ about employees of _____ race: it's not a particularly great assessment, because it doesn't mean anything.
And you didn't have to perform surveys, tests etc. to come to that conclusion.
As far as IQ tests are concerned, this has been studied many times before, and not just by Nazis. The null hypothesis that all races have the same average IQ has never been rejected on statistical grounds: the vast majority of research has indicated that there ARE differences, according to current testing methods. This may change in the future, who knows.
When I say research further, I don't mean that it's necessary or deserving of grants. However, I think it is a worthwhile topic to investigate as far as equality is concerned: have we achieved it, and if not, then why? If you study statistics a little you'll tend to find that different groups of people of all types (ie: NJ residents vs. WA residents, 17 year olds vs. 19 year olds, etc.) will score differently in certain measures... sometimes due to chance, sometimes not.
One of the interesting things about IQ is that it is constantly changing in the population. Over time, our average IQ has increased. This may affect ethnic groups differently, and perhaps it shows that there is something flawed in the original tests. Or maybe we're just getting smarter.
As for what this means for the individual... it doesn't mean anything. You can be smart or dumb regardless of race, but studies have shown that some groups average a few points higher or lower than others.
Environment can play a huge part in this and not just on a macro level. If you happen to be a kid who grew up with a computer and were exposed to educational materials, you might have a leg up on someone who didn't have the same access. Wouldn't necessarily make you more intelligent.
Drop a city kid on a farm and let him milk a bull... see who's smarter in that situation.
