You find a positive relationship between mother's education and respondent's income at age 40. The relationship remained after controlling for family social class. This means

You find a positive relationship between mother's education and respondent's income at age 40. The relationship remained after controlling for family social class. This means



A. social class is really the causal variable.
 
B. social class does not have an effect on the relationship.


C. the original relationship is spurious.


D. income is caused by neither mother's education level nor social class.


E. mother's education no effect on future respondent income.

  Answer Key: B


Research

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