Question: 16.19 From a science class of 12 equally capable students preparing for an entrance examination, 5 students are selected at random and given additional coaching

16.19 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:
Grades of students who receive additional coaching 85 75 72 81 90 Grades of students who do not receive additional coaching 67 74 84 79 93 88 68 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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