An economist noticed that nations with more TV sets have higher life expectancies.He established with a scatterplot a high positive correlation between length of life and number of TV sets.Find the lurking variable,if there is one.
A)Sofa
B)TV sets brands
C)Popcorn
D)Wealth of the nation
E)No lurking variable

Question

Quizplus · Accepted Answer

It is likely that nations with higher GDPs are able to afford more TV sets and also have better healthcare systems, leading to higher life expectancies. Therefore, the lurking variable in this scenario is the wealth of the nation.

An Economist Noticed That Nations with More TV Sets Have