According to a Pew Research Center study, in May 2011, 35% of all American Points: 10 out of 10 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 300 community college students at random and finds that 120 of them have a smart phone. In testing the hypotheses

H0: p = 0.4 vs Ha: p > 0.4,

a. What is the test statistic?

According to a Pew Research Center study, in May 2011, 33% 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 349 community college students at random and finds that 138 of them have a smart phone. In testing the hypotheses:

H0: p = 0.33 vs Ha: p > 0.33
she calculates the test statistic as z = 2.5990.

Then the p‑value = .