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Answer:

Dr. Powers' research is an example of evaluation research.

This is because the research seeks to assess the effectiveness of alcohol and drug rehabilitation programs by measuring the number of people who relapse within a specified time period.

Evaluation research aims to gauge the impact or outcomes of a particular intervention, program, or policy, and in Dr. Powers' case, the intervention is alcohol or drug rehab programs and the outcome being measured is the number of people who relapse within one year.

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