Test Bank For Intermediate Statistical Investigations 1th Edition by Nathan Tintle, Beth L. Chance, Karen McGaughey, Soma Roy, Todd Swanson, Jill VanderStoep

Test Bank For Intermediate Statistical Investigations 1th Edition by Nathan Tintle, Beth L. Chance, Karen McGaughey, Soma Roy, Todd Swanson, Jill VanderStoep-Questions 1 through 3: A study published in Psychological Science in 2007 examined a possible link between mindset and health. The following is an excerpt from the abstract of the article: ―84 female room attendants working in seven different hotels were measured on physiological health variables affected by exercise. Those in the informed condition were told that the work they do (cleaning hotel rooms) is good exercise and satisfies the Surgeon General's recommendations for an active lifestyle. Examples of how their work was exercise were provided. Subjects in the control group were not given this information.‖ 1. Identify the experimental units in this study. A. The eighty-four room attendants FOR INSTRUCTOR USE ONLY 1-2 B. The seven different hotels C. The physiological health variables D. The two groups (informed and control) Ans: A; LO: 1.1-4; Difficulty: Easy; Type: MC 2. The researchers chose to include room attendants from seven different hotels (as opposed to using stricter inclusion criteria that would limit the study to room attendants at one particular hotel). Describe the consequences of this decision. Using broader inclusion criteria may (increase/decrease) the amount of variation in the observed health outcomes. However, this decision also (supports/limits) generalizability to a larger population of room attendants. Ans: increase, supports; LO: 1.1-3; Difficulty: Medium; Type: FIB 3. Room attendants were randomly assigned to either the informed condition or the control group. What is the most important reason for the random assignment? A. Random assignment ensures that the study is double-blind. B. Random assignment reduces the impact of outliers. C. Random assignment creates two groups of room attendants that are as similar as possible, which supports cause-and-effect conclusions. D. Random assignment makes it possible to generalize the results to the population. Ans: C; LO: 1.1-3; Difficulty: Medium; Type: MC Questions 4 through 6: An online retailer is using an experiment to decide whether to modify their website. When visitors type in the web address or click a link to the site, they are randomly re-directed to one of two versions of the website: the version that has been in use for the last year (version A) or an updated version (version B). The retailer’s goal is to maximize the amount of time (in minutes) visitors stay on the site. 4. Identify the experimental units and variables. Note: One of the answer choices will not be used. Experimental units: A. Version of the website (A and B) Explanatory variable: B: Online retailers Response variable: C: Visitors to the website D: Time spent on the website (in minutes) Ans: Experimental units: C, Explanatory variable: A, Response variable: D; LO: 1.1-4; Difficulty: Easy; Type: Ma 5. Consider two possible models for analyzing time spent on this retailer’s website. Single-mean model: A. Predicted timespent onsite 12.33,SEof residuals 4.64