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Diagnose the methodological flaw in Dr. Ramirez's experimental design based on the concept of a placebo control condition. How should she modify Group B to properly attribute the results to the stimulant?
Case context: Dr. Ramirez is testing a new energy drink intended to increase studying stamina. Group A receives the actual energy drink containing the new stimulant formula. Group B receives nothing and is simply told to study as usual. Both groups are aware of the study's purpose. Dr. Ramirez concludes the stimulant is highly effective because Group A studied significantly longer than Group B.
Question: Diagnose the methodological flaw in Dr. Ramirez's experimental design based on the concept of a placebo control condition. How should she modify Group B to properly attribute the results to the stimulant?
Sample answer: The flaw is that Group B did not receive a placebo control condition, meaning Group A's improvement could simply be due to the expectation of improvement rather than the active stimulant. To fix this, Group B must receive a simulated intervention—a drink that appears identical to the new energy drink but lacks the active stimulant ingredient.
Key points:
- The current design lacks a placebo control condition.
- Group A's results might be due to expectation rather than the active ingredient.
- Group B should receive a simulated intervention.
- The simulated intervention must look identical but lack the active ingredient.
Rubric: A full-credit response must identify the lack of a placebo control group, explain that the current design fails to control for expectation of improvement, and propose giving Group B a simulated drink lacking the active ingredient.
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Research Methods in Psychology - 4th American Edition @ KPU
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