psychology
posted by ashley .
if there is a positive correlation between the number of computers one possesses and the personâ€™s heart health. what is a third variable (X) that may explain this correlation that is a cause of each one of the two variables. If X goes up the number of computers is likely to increase and heart health is likely to be better

psychology 
PsyDAG
Might it be socioeconomic status or income?
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