From a mathematics class of 12 equally capable students using programmed materials, 5 are selected at random and given additional instruction by the teacher. The results on the final examination were as follows. Use the rank-sum test with ? = 0.05 to determine if the additional instruction affects the average grade.

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Grade Additional 69 78 91 80 87 Instruction No Additional 75 93 79 67 88 Instruction 64 82