Triola Elementary Statistics 14e Chapter 1 Test MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Determine whether the given description corresponds to an experiment or an observational study. A stock analyst selects a stock from a group of twenty for investment by choosing the stock with the greatest earnings per share reported for the last quarter. A) Observational study B) Experiment Objective: Exam A
2) Identify which type of sampling is used. The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag. A) Stratified B) Simple Random C) Convenience D) Cluster E) Systematic Objective: Exam A
3) Identify which type of sampling is used. To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day. A) Stratified B) Simple Random C) Convenience D) Systematic E) Cluster Objective: Exam A
4) An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools. Does this sampling plan result in a random sample? Simple random sample? Explain. A) Yes; yes. The sample is random because all teachers have the same chance of being selected. It is a simple random sample because all samples have the same chance of being selected. B) Yes; no. The sample is random because all teachers have the same chance of being selected. It is not a simple random sample because some samples are not possible, such as a sample that includes teachers from schools that were not selected. C) No; yes. The sample is not random because teachers in small schools are more likely to be selected than teachers in larger schools. It is a simple random sample because all samples have the same chance of being selected. D) No; no. The sample is not random because teachers in small schools are more likely to be selected than teachers in larger schools. It is not a simple random sample because some samples are not possible, such as a sample that includes teachers from schools that were not selected. Objective: Exam A
5) Identify the type of observational study used. A town obtains current employment data by polling 10,000 of its citizens this month. A) Retrospective B) Cross-sectional C) Prospective D) None of these Objective: Exam A
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