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Suppose you have the data on scores (in a 100-point scale) given by 20 students of school A, 20 students of school B and

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Suppose you have the data on scores (in a 100-point scale) given by 20 students of school A, 20 students of school B and 15 students of school C regarding the COVID protocol followed in the schools. How will you test whether the median score of the three schools differ significantly?

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