# To explain:The purpose of the study.

To explain:The purpose of the study.
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Justification:
The researcher had conducted a study for seeing the effectiveness of the pain medication and selected the subjects randomly and recorded on a scale of 1 to 10 about the severity of the pain. This implies that the purpose of the study is to know about the pain medication effectiveness.
Thus, the purpose of the study is to determine how effective the pain medication is.