Do you think African American students, 15 years ago, were spending time studying how to use computers? I think it's rather likely because:
- I've never heard of this
- Such playing-with-computers is something that was confined to the somewhat richer and educated people in American society, which the african-americans were not, 15 years ago.
I doubt that my audience thinks the exact way I do, and I doubt I have any bias that needs to be confirmed.