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According to a Pew Research Center study, in May 2011, 42% of all American adults had...

According to a Pew Research Center study, in May 2011, 42% 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 420 community college students at random and finds that 188 of them have a smart phone. Then in testing the hypotheses:

H0: p = 0.42 versus

Ha: p > 0.42,

what is the test statistic?

z =  . (Please round your answer to two decimal places.)

Math   Statistics-And-Probability   
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