A Pew Research Center survey found that social net-working is popular in many nations around the world. The file ­Global Social Media contains the level of social media networking (measured as the percentage of individuals polled who use social networking sites) and the GDP at purchasing power parity ( PPP ) per capita for each of 24 emerging and developing countries. (Data extracted from Pew Research Center, “Emerging Nations Embrace Internet, Mobile Technology,” bit. ly/ 1mg8Nvc.)
a. Compute the covariance.
b. Compute the coefficient of correlation.
c. Based on ( a) and ( b), what conclusions can you reach about the relationship between the GDP and social media use?