A Pew Research Center survey found a noticeable rise in smartphone ownership and internet usage in emerging and developing nations, and once online, adults in these nations are hungry for social interaction. The file GlobalInternetUsage contains the level of Internet usage, measured as the percentage of adults polled who use the Internet at least occasionally or who report owning a smartphone, and the GDP. The file GlobalSocialMedia contains the level of social media networking, measured as the percentage of Internet users who use social media sites, and the GDP at purchasing power parity (PPP, current international $) per capita for each of 28 emerging and developing countries.

Source: Data extracted from Pew Research Center, “Smartphone Ownership and Internet Usage Continues to Climb in Emerging Economies,” February 22, 2016, pewrsr.ch/1RX3Iqq.

For the relationship between percentage of Internet users polled who use social networking sites, and GDP and the relationship between the percentage of adults polled who use the Internet at least occasionally and GDP:

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 and the relationship between the percentage of adults polled who use the Internet at least occasionally and GDP?