The report "How Teens Use Media" (Nielsen, June 2009) says that 37% of teens in the U.S. access the Internet from a mobile phone. Suppose you plan to select a random sample of 500 students at the local high school and will ask each student in the sample if he or she accesses the Internet from a mobile phone. You plan to use the resulting data to decide if there is evidence that the proportion of students at the high school who access the web using a mobile phone differs from the national figure given in the Nielsen report. What hypotheses should you test?