Question: study whether there is a correlation between playing a musical instrument and grade point average (GPA), a teacher randomly selected 20 students who play an

study whether there is a correlation between playing a musical instrument and grade point average (GPA), a teacher randomly selected 20 students who play an instrument and 20 students who do not play an instrument, and compared their GPAs. Is the study observational or experimental? If it is an experiment, what is the controlled factor? Select

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