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Please answer quickly (4)ln the study of the effectiveness of a certain exercise in weight reduction 3 group of 10 persons engaged in the exercises

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(4)ln the study of the effectiveness of a certain exercise in weight reduction 3 group of 10 persons engaged in the exercises for one month and showed the following results. Judge whether the exercises are effective at 0.05 level Weight 84 93 46 81 75 80 63 85 before Weight 83 90 47 79 77 83 65 82

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