A sociologist wanted to investigate how well a person’s salary can be predicted by
the combination of their intelligence quotient (IQ) and the number of years they have been
formally educated. She therefore published a survey in which participants self-reported
their salary in dollars, completed an IQ battery, and self-reported the number of years they
have spent in post-secondary education. The IQ questionnaire was collapsed into a
continuous-valued composite IQ index. What analysis should the researcher perform to
assess the combined influence of IQ and educational attainment on salary?
Sample Solution
