Will you live longer if you use the Internet? Figure 4.9 (page 168) is a scatterplot of life expectancy versus Internet users per 100 people for 181 countries. In Exercise 4.20 you described this relationship. Make a plot of the data similar to Figure 4.9 and report the correlation.
Exercise 4.20
Will you live longer if you use the Internet? The World Bank collects data on many variables related to world development for countries throughout the world. Two of these are Internet use, in number of users per 100 people, and life expectancy, in years.12 Figure 4.9 is a scatterplot of life expectancy versus Internet users.
(a) Describe the relationship between these two variables.
(b) A friend looks at this plot and concludes that using the Internet will increase the length of your life. Write a short paragraph explaining why the association seen in the scatterplot does not provide a reason to draw this conclusion.