Yes. I'd wager Jewish infants adopted into a random family would perform better than black infants adopted into the same family, in a controlled study.
You cannot draw a conclusion to an experiment you are yet to perform.At the very least, it does not count as scientific.
Yes you can, it's called prediction.
It looks more like a prophecy.
This experiment has already been performed. The results are complex and controversial.
You're probably right, but for the wrong reasons. Racism leads to positive and negative expectations [1]. And do explain how you'd control for expectations based on race in your study.