According to a Pew Research Center study, in May 2011, 38% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 362 community college students at random and finds that 173 of them have a smart phone. Then in testing the hypotheses:

H0: p = 0.38 versus

Ha: p > 0.38,

what is the test statistic?