Ffom an English class of 18 students using programmed materials, 10 are selected at random and given additional instruction by the teacher. The results on the final examination were as follows: Grades in the Final Examination With Additional No Additional Instruction Instruction 87 75 91 78 85 81 80 85 86 72 85 80 81 81 85 85 73 79

Q: EX3\ Xi -- Xu iid B() ind sotE minimum sufficient

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