Math 2311 EMCF Homework 8 Sections 6.1-6.3 Honework will NOT be accepted through email or in person. Homework must be submitted through CourseWare, https://www.casa.uh.edu, before the deadline. Submit this assignment on CourseWare under \"EMCF\" and choose ehw8. 1. A marketing company offers to pay $25 to the first 100 persons who respond to their advertisement and complete a questionnaire regarding displays of their client's product. This situation is an example of a a. b. c. d. Simple random sample Convenience sample Voluntary response sample Multistage sample 2. A SRS was selected of large urban school districts throughout New England. The selected districts were identified as target districts. Within each district, a SRS of its high schools was chosen and the principals of those high schools were interviewed. This situation is an example of a a. b. c. d. Simple random sample Convenience sample Voluntary response sample Multistage sample 3. Refer to question 2. Could the results of these interviews be used to infer responses of the population of high school principals in New England? a. Yes b. No Use this information for questions 4 and 5: In order to assess the membership's attitudes about a new Supreme Court decision, a local bar association selects a SRS of 100 lawyers from its membership list. Surveys are delivered to the selected lawyers. 63 of the lawyers return their surveys. 43 of the respondents disagree with the new ruling. 4. Which of the following is of great concern in this situation? a. b. c. d. e. Nothing is known about the parameters of the population of interest. Nothing is stated about the methodology of the SRS. There may be a problem with the sampling frame. There may be a problem with non-response bias. None of these is true. 5. Which of the following statements is true? a. b. c. d. e. The sample is the membership of the bar association. The sample is the 100 selected lawyers. The sample is the 63 respondents. The sample is the 43 who disagree with the new ruling. None of these is true. 1 6. Voluntary response samples often under represent people with strong opinions. a. True b. False 7. Convenience samples often lead to under coverage bias. a. True b. False 8. Questionnaires with non-neutral wording are likely to have response bias. a. True b. False 9. In an observational study we impose a treatment on the subjects. a. True b. False 10. The entire group of individuals we want information about is called the sample. a. True b. False 11. A study is _______________ if it systematically favors certain outcomes. a. b. c. d. e. Biased Confounding Simple Convenient None of these 12. Which of the following describes a simple random sample (SRS)? a. b. c. d. e. successively smaller groups are selected within the population in stages choosing the individuals easiest to reach selecting one random value then choosing a cluster of subjects around it every possible sample of a given size has the same chance to be selected none of these Use the following information to answer questions 13-15: A personnel director at a large company studied the eating habits of employees by watching the movements of a selected group of employees at lunchtime. The purpose of the study was to determine the proportion of employees who buy lunch in the cafeteria, bring their own lunches, or go out to lunch. 13. The study could best be categorized as: a. b. c. d. e. a census a survey sample an observational study a designed experiment none of these 2 14. If the director includes only the employees in one department in her study, she is performing a a. b. c. d. e. simple random sample quota sample convenience sample multi-stage sample census 15. If the director selects 50 employees at random from throughout the company and categorizes their lunchtime practices by gender, she is: a. b. c. d. e. blocking for gender testing for a lurking variable promoting sexual harassment testing for bias none of these 3 \f\f