A Pew Research Center survey found that social net working is popular in many nations around the world. The file contains the level of social media net- working (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 25 selected countries. (Data extracted from Pew Research Center, "Global
Digital Communication: Texting, Social Networking Popular
Worldwide," updated February 29, 2012, via the link bit.lv/sNjsmq).
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?