Question 6 Short-term classes: Does taking a class in a short-term format (8 Select one answer. weeks instead of 16 weeks) increase a student's likelihood of passing 10 points the course? For a particular course, the pass rate for the 16-week format is 59%. A team of faculty examine student data from 40 randomly selected accelerated classes and determine that the pass rate is 78%. Which of the following are the appropriate null and alternative hypotheses for this research question? A. o Ho: p = 0.59; Ha:p = 0.59 B. Ho: p = 0.59; Ha: P > 0.59 C. o Ho: p = 0.78; Ha: p # 0.78 D. - Ho: p = 0.78; Ha: p > 0.59 Question 7 One population proportion test: Which of the following Select one answer. situations involves testing a claim about a single population 10 points proportion? A. A recent report estimated that 25% of all college students in the United States have a sexually transmitted disease (STD). The director of the campus health center believes that the proportion of students with STDs is higher at their campus. B. According to the American Heart Association guidelines, the daily maximum amount of sugar a teenager should have is 4 teaspoons. The parents of a local high school have expressed concerns that the average daily sugar intake of their students is higher than these guidelines and have been pressuring school officials to limit unhealthy snack and beverage choices offered in the cafeteria and student store. C. Duke University researchers discovered that not only do women need more sleep than men but also that women tend to suffer more than men, both mentally and physically, if they are sleep deprived. A statistics class wanted to investigate the claims of this study and collected data to determine if women at their college sleep more, on average, than men. D. . The National Center for Health Statistics issued a report that stated that women in every age group in the United States were more likely than men to have serious mental health problems. A group of researchers want to design a study to further examine these results. Question 8 According to a Pew Research Center study, in May 2011, 32% of all Type numbers in American adults had a smart phone (one which the user can use to the boxes. read email and surf the Internet). A communications professor at a 10 points university believes this percentage is higher among community college students. She selects 420 community college students at random and finds that 167 of them have a smart phone. Then in testing the hypotheses: Ho: P = 0.32 versus Ha: P > 0.32, what is the test statistic? Z = . (Please round your answer to two decimal places.)
