The report “How Teens Use Media” (Nielsen, June 2009) says that 67% of U. S. teens have a Facebook page that they update at least once a week. Suppose you plan to select a random sample of 400 students at the local high school. You will ask each student in the sample if he or she has a Facebook page and if it is updated at least once per week. You plan to use the resulting data to decide if there is evidence that the proportion of students at the high school who have a Facebook page that they update at least once a week differs from the national figure given in the Nielsen report. What hypotheses should you test?