7. Social networking is becoming more and more popular around the world. Pew Research Center used a survey of adults in several countries to determine the percentage of adults who use social networking sites (USA Today, February 8, 2012). Assume that the results for surveys in Great Britain, Israel, Russia, and United States are as follows. Country Use Social Great Israel Russia United Networking Britain States Sites Yes No 344 265 301 500 456 235 399 500 a. Conduct a hypothesis test to determine whether the proportion of adults using social networking sites 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 networking sites? c. Using a .05 level of significance, conduct multiple pairwise comparison tests among the four countries. What is your conclusion?