A professor wants to test the impact of a training session attended by 20 students. He assessed

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A professor wants to test the impact of a training session attended by 20 students. He assessed the performance before the session based on the given learning objectives as well as after the session based on the same learning objectives. Under what conditions do you think the professor can use a paired \(t\)-test to test the difference in the performance before and after the test?

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