This may just be a pricing factor. People that earn more money and more discretionary income are able to and want to purchase luxury, or higher-quality, goods.

This may just be a pricing factor. People that earn more money and more discretionary income are able to and want to purchase luxury, or higher-quality, goods. Those at lower income levels with less discretionary income will either not purchase the high priced goods, or will try to acquire a similar product at a lower price. In other words, the rich are less price sensitive than the poor. Thus, I don't see how one can make a connection between education and Apple ownership without correcting for income.