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According to a Pew Research Center study, in May 2011, 39% of all American Type numbers in the boxes. adults had a smart phone (one which the user can use to read email and surf 10 points the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 448 community college students at random and finds that 188 of them have a smart phone. Then in testing the hypotheses: H: p = 0.39 versus He: p > 0.39, what is the test statistic? Z= (Please round your answer to two decimal places.) Question 30 Find the p-value for the hypothesis test. A random sample of size 55 is taken. Type numbers in the boxes. The sample has a mean of 422 and a standard deviation of 85. 10 points Ho: u = 400 H: > 400 The p-value for the hypothesis test is Your answer should be rounded to 4 decimal places.

Answer 1

Question - 29 otot borot at Here, the given test is a right - tailed test The test statistic is, z p* _ Po 2 Po (I-Pol N Po = 0.39, p* 188 where a, N = 448 448 (188 448 0.39 ". Z= 01.29 0.39 ×(1-0.39) 448

Question - 30 0 Here, the given test is a right -tailed test Given that, M = 400, X = 422 , 5 = 85, n = 55 . The test statistic, z = Ix-M si sn (422-400) ie 85/555 P[ z > 1.92 0.5-ploczcl.92) 0.5 -0.4726 7 = = 1.92 ir p-value 0 1.92 0.0274