An Economist Noticed That Nations with More TV Sets Have

Multiple Choice

An economist noticed that nations with more TV sets have higher life expectancy.He established a strong positive association between length of life and number of TV sets.Describe three different possible cause-and-effect relationships that might be present.

A) Perhaps more TV sets cause higher life expectancy,higher life expectancy causes more TV sets,or both could be caused by a lurking variable such as the wealth of the nation.
B) There is only one cause-and-effect relationship: more TV sets cause higher life expectancy.
C) Perhaps more TV sets cause higher life expectancy,higher life expectancy causes more TV sets,or both could be caused by a lurking variable such as the TV sets brand.
D) There is only one cause-and-effect relationship: higher life expectancy causes more TV sets.
E) There are only two cause-and-effect relationships: more TV sets cause higher life expectancy,or higher life expectancy causes more TV sets.