Imagine a Researcher Wanted to Investigate Whether There Was a Significant

Imagine a researcher wanted to investigate whether there was a significant correlation between IQ and annual income, but she had reason to believe that work ethic would influence both of these variables. What should she do?

A) Conduct a partial correlation to look at the relationship between IQ and annual income while partialling out the effect of work ethic.
B) Conduct a semi-partial correlation to look at the relationship between IQ and annual income while partialling out the effect of work ethic.
C) Conduct a partial correlation to look at the relationship between work ethic and annual income partialling out the effect of IQ.
D) Conduct a semi-partial correlation to look at the relationship between IQ and work ethic while partialling out the effect of annual income.