Since 2000, the Median Wage in the United States Has

Multiple Choice

Since 2000, the median wage in the United States has risen by 1%, while the median wage for every educational subgroup (high school dropouts, high school graduates, college graduates, and people with advanced degrees) has decreased. This apparent contradiction is an example of:

A) extrapolation.
B) Simpson's paradox.
C) causation.
D) correlation.