According to a Pew Research Center study, in May 2011, 41% of all American adult had a smart phone (one which the user can use to read email and surf the Internet) communications professor at a university believes this percentage is higher among community college students. She selects 317 community college students at rando and finds that 149 of them have a smart phone. Then in testing the hypotheses: HO: p = 0.41 versus Ha: p > 0.41, what is the test statistic? Oz =2.17 O z=-2.67 O z = 2.67 Oz=-2.17