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A researcher wants to study the effect of a new teaching method on student test scores. She randomly assigns 30 students to use the new method and 30 students to use the traditional method, then compares their scores. This study is best described as:
A researcher wants to study the effect of a new teaching method on student test scores. She randomly assigns 30 students to use the new method and 30 students to use the traditional method, then compares their scores. This study is best described as: