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Statistics - Stress Levels

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Stress levels of three different classes of physics students were measured on a scale of 1 to 20, with 20 being the greatest level of stress. At a 0.05 significance level, are the stress levels equal among all remaining students at the end of week 5 in all three classes?

Class #1 Class #2 Class #3
9 13 10
7 20 9
11 14 15
9 13 14
12 15
10

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Stress levels of different classes of physical students were measured on a scale of 1 to 20.

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