This is a a controlled experiment b observational

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34. This is a:
35. The explanatory variables are:
36. The response variable is:
37. How many treatment groups are there in this study? a) 3 b) 4 c) 5 d) 6 e) 7
38. If we would like the treatment to be balanced in terms of the number of subjects, how many students should we assign to each treatment?
39. Researchers wanted to study whether or not Botox injected under the arms can reduce sweating. Which of these is a matched pairs design?
40. Suppose each subject has one underarm injected with Botox, and the other with salt water. Which is the best way to make the assignment?
41. A midterm evaluation of a recitation instructor's teaching asked students to rate their instructor's preparation for class by choosing from one of the following: a) excellent; b) good; and, c) needs improvement. We may expect a summary of the instructor's teaching, based on the survey results, to be: a) Unbiased b) Biased towards an unfavourable summary c) Biased towards a favorable summary
42. For which of the following questions would we expect the most honest responses?
43. What additional option should be included in the following survey question: “How often do you dream in black and white?” Options are “always,” “sometimes” and “never”.
44. Consider this survey question: “Every year, thousands of people, including children, are injured or killed because of the widespread availability of firearms in the United states. Do you agree that our country needs stricter gun control laws?” The response that surveyors hope to elicit is:

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