Type numbers in the boxes. 10 points 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 298 community college students at random and finds that 138 of them have a smart phone. Then in testing the hypotheses: = Ho: p 0.38 versus Ha: p > 0.38, what is the test statistic? z= (Please round your answer to two decimal places.)