Question: 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

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. Grade Additional 69 78 91 80 87 Instruction No Additional 75 93

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

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