Essay
The table below shows the marginal benefit per year (in dollars) and the marginal cost per year (in dollars) of hiring additional police officers in a small community. 
Grasp the concepts and implications of internal and external validity.
Analyze the effects of expectancy, especially experimenter and participant expectancy, on research outcomes.
Understand the methodology and importance of double-blind and single-blind experiments.
Recognize the significance of controlling for placebo effects in experimental research.
Definitions:
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