Question: From a science class of 12 equally capable students preparing for an entrance examination, 5 students are selected at random and given additional coaching by

From a science class of 12 equally capable students preparing for an entrance examination, 5 students are selected at random and given additional coaching by an expert. Their grades are noted:

Use the rank-sum test with α = 0.05 to determine if the additional coaching affects the average grade of students in the entrance examination.

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