Difference between correlational and quasi experimental research

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which research methodology is used below?
A researcher is interested in studying the effects of ambient sounds to help Grade 2 students focus on their school activities. They have all Grade 2 students from a local elementary school listen to sounds recorded in a forest while having them complete a math test. The performances of the Grade 2 students are recorded as follows (lowest score is 0, highest score is 10):

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