Internet use and life expectancy

Internet use and life expectancy. The following scatterplot was created as part of a study evaluating the relationship between estimated life expectancy at birth (as of 2014) and percentage of internet users (as of 2009) in 208 countries for which such data were available.23

(a) Describe the relationship between life ex- pectancy and percentage of internet users.

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(b) What type of study is this?

(c) State a possible confounding variable that might explain this relationship and describe its potential effect.

Percent Internet Users

Life Expectancy at Birth

0% 20% 40% 60% 80% 100%






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