1. FACEBOOK: In 2014, Facebook reported that 23% of its users were ages 18 - 24, a decrease from the 2011 level of 30.9%. (Though this is partly due to more older people joining Facebook, there was nevertheless a loss of over 3 million users in this age group.) In 2015, a survey of 500 randomly selected Facebook users showed that 105 of them were ages 18 - 24. Test whether the population proportion of Facebook users who are ages 18 - 24 has decreased from 23%.