IMathAS-libretexts

Students in a large statistics class were randomly divided into two groups. The first group took the midterm exam with soft music playing in the background, while the second group took the exam with no music playing. The scores of the two groups on the exam were compared. This experiment is not blind because:

students were allowed to keep their eyes open while taking the exam
the exam was too long
the students know whether or not music was playing while they were taking the exam
some of the studetns did not study for the exam.
students were randomized into the two groups.

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