Chpt7 - Chapter7

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Chapter 7 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Is the observed sample proportion unusual? 1) Assume that 20% of students at a university wear contact lenses. We randomly pick 200 students. Would it be unusual to obtain a sample proportion of 22%? Answer by calculating the appropriate z - score. A) Yes, z = 0.71 B) No, z = 0.71 C) No, z = 25 D) No, z = 0.68 E) Yes, z = 25 1) Find the mean/standard error of the sampling distribution of the proportion. 2) Assume that 26% of students at a university wear contact lenses. We randomly pick 300 students. Describe the sampling distribution model of the proportion of students in this group who wear contact lenses. A) mean = 26%; standard error = 1.1% B) There is not enough information to describe the distribution. C) mean = 74%; standard error = 2.5% D) mean = 26%; standard error = 2.5% E) mean = 74%; standard error = 1.1% 2) 3) A candy company claims that its jelly bean mix contains 21% blue jelly beans. Suppose that the candies are packaged at random in small bags containing about 400 jelly beans. Describe the sampling distribution model of the proportion of blue jelly beans in a bag. A) mean = 79%; standard error = 0.8% B) There is not enough information to describe the distribution. C) mean = 21%; standard error = 2.0% D) mean = 21%; standard error = 0.8% E) mean = 79%; standard error = 2.0% 3) Select the most appropriate answer. 4) A student group at a university conducted a poll to determine what percentage of students would vote republican in the upcoming presidential election. The poll randomly surveyed 500 students, 275 of which were female. If 54% of the university ʹ s 8200 students are female, which of the following identifies the data distribution of gender at this university? A) P(1)
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Chpt7 - Chapter7

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