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During an Experiment to Evaluate the Effectiveness of a New

Question 20

Multiple Choice

During an experiment to evaluate the effectiveness of a new public relations program used by a police department to improve its relationship with the community, an errant police officer shoots and kills an unarmed teenager. What type of threat to the internal validity of this experiment's results is this problem?


A) Maturation
B) Mortality
C) Regression
D) History

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