Social media is becoming more and more popular around the world. Statista.com provides estimates of the number of social media users in various countries in 2017 as well as the projections for 2022. Assume that the results for surveys in the United Kingdom, China, Russia, and the United States are as follows. 

a. Conduct a hypothesis test to determine whether the proportion of adults using social media is equal for all four countries. What is the p-value? Using a .05 level of significance, what is your conclusion? 

b. What are the sample proportions for each of the four countries? Which country has the largest proportion of adults using social media? 

c. Using a .05 level of significance, conduct multiple pairwise comparison tests among the four countries. What is your conclusion?

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Country Use Social United United Media Kingdom China Russia States Yes 480 215 343 640 No 320 285 357 360