A Pew Research Center survey found that social networking is popular in many nations around the world. The file GlobalSocialMedia contains the level of social media networking (measured as the percent 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 "Global Digital Communication: Texting, Social Networking Popular Worldwide," Pew Research Center, bit.ly/sNjsmq.)
a. Perform a cluster analysis using the complete linkage method on the nations based on the level of social media networking (measured as the percent of individuals polled who use social networking sites) and the GDP at purchasing power parity (PPP) per capita.
b. What conclusions can you reach about which nations are most similar?