The data with this comes from the Bureau of Labor Statistics and includes both salary and hourly wages. Managers are higher up the salary chain, which makes sense, with Computer and Information Systems Managers taking home the highest average salaries of all, right around $72/hour. The lowest job on the chart, technical support representative, makes $16.70/hour, a full 75% less. That's still not bad money when you consider that federal minimum wage is $7.25/hour.
HowMuch also points out that all the jobs on here pay above average compared to the rest of the economy. With two members of the same household working as technical support representatives (again, the bottom slot) that household would still make $10,000 over the median household income in the US, $59,000 a year. So again, not bad advice from your overbearing uncle.
If you're not feeling tech (or you just want to prove him wrong), check out this list of employers paying over $100,000 a year.