In an attempt to reduce the number of person hours lost
In an attempt to reduce the number of person-hours lost as a result of industrial accidents, a large multi-plant corporation installed new safety equipment in all departments and all plants. To test the effectiveness of the equipment, a random sample of 25 plants was drawn. The number of person-hours lost in the month before installation of the safety equipment and in the month after installation was recorded. Can we conclude that the equipment is effective?

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