Q Math 54 Collected Work Section 1.6 Collected Work Name: Total points: 10 1. A statistics instructor wants to see if allowing students to use a notecard on exams will affect their overall exam scores. The instructor thinks that the results could be affected by the type of class: traditional, Web-enhanced, or online. He randomly selects half of his students from each type of class to use notecards. At the end of the chapter the exam score for those using notecards is compared to the exam score for those without notecards. a. What type of experimental design is this? b. What is the response variable in this experiment? c. What is the factor that is set to predetermined levels? What are the treatments? d. Identify the experimental units? 2. Nucryst Pharmaceuticals, Inc., announced the results of its first human trial of NPI32101, a topical form of its skin ointment. A total of 225 patients diagnosed with skin irritations were randomly divided into three groups as part of a double-blind, placebo-controlled study to test the effectiveness of the new topical cream. The first group received a 0.5% cream, the second group received a 1.0% cream, and the third group received a placebo. Groups were treated twice daily for a 6-week period. a. What type of experiment design is this? b. What is the factor that is set to predetermined levels? What are the treatments? c. What does it mean for this study to be double-blind? d. What is the control group for this study? e. Identify the experimental units. 1

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