AgainstAllOdds_FacultyGuide_Unit15.pdf

2 sample answer this is a very poorly designed

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2. Sample answer: This is a very poorly designed experiment. First, it involved only two classes, which were at different schools and taught by different teachers (one more experienced than the other). The treatments, using the animated lessons compared to using handouts/ discussions, were not randomly assigned. Instead, only one of the two schools had sufficient numbers of computers to allow implementation of the animated science curriculum. Miss Earls’ school was probably in a more affluent area than Mrs. Morrow’s school – this conclusion is based on students’ access to computers and the lower class size. So we don’t even know if students in the two classes were similar in terms of their academic preparedness. Furthermore, Miss Earls designed the test, which may be biased toward the animated science lessons. Miss Earls’ school should not have purchased the animation science curriculum based solely on the outcome of this experiment. 3. a. This is an observational study – a prospective study. It takes a group of people, both smokers and nonsmokers, and observes them over a nine-year period. The response variable is whether or not the subject gets diabetes. The purpose of the study is to describe the Random Allocation Group 1 60 subjects Group 2 60 subjects Work by Hand Word Processor Compare Essay Grades
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Unit 15: Designing Experiments | Faculty Guide | Page 7 response variable (diabetic/not diabetic) for those who were smokers versus nonsmokers at the start of the study as well as those who were smokers and later quit smoking. Background: In the article “Smoking, Smoking Cessation, and Risk for Type 2 Diabetes Mellitus” the design of the study was listed as a prospective cohort study. b. You cannot conclude that quitting smoking causes diabetes. Most people who quit smoking also gain weight. Weight increases are also associated with diabetes. So, it would be impossible to tell whether the diabetes was caused by the cessation of smoking or the weight gain. 4. Sample answer: Randomly select the stores that consumer pairs will enter. Consumers should dress similarly – casual clothes suitable for visiting a mall (not too shabby but not too upscale either). The consumer pairs should be randomly assigned. Each pair should be randomly assigned to a store, complete their task and then be randomly assigned to the next store. There should be recorders with stopwatches to record the time it takes for a clerk to respond to a consumer pair.
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