Explanation:
Contamination can have undesirable consequences in real experiments, some of them are related to the feelings that may arise in the research participants, the contamination bias reduces the differences between the research groups, and can cause a comparison between the treatments of each different group, the which can generate conflicts and rivalries on the part of groups that consider themselves to be inferior to others. These contamination-related problems can significantly interfere with the research results.
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The end of the Han Dynasty was the result of a series of revolts by palace eunuchs who had begun to grow in power.
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Answer:
This study was an experiment.
Explanation:
An experiment demonstrated to compare the behavior of the two groups, the one who watched the violent film and the the one who did not. the research was made to figure out the impact of violence in human development.