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The table below represents the mathematics grades of two senior classes in a high school. class 1 12 13 6 17 18 11 12 14 11 8 9 7 5 11 class 2 5 6 7 8 11 15 16 17 12 19 3 4 5 12 Curious about which class is better performing, the math coordinator wants to know if the difference in average between these two classes is significant or not? He asks you for the name and arguments to use the appropriate statistical test, then to do all the necessary analysis and draw the conclusions by using PSPP.