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Suppose that 100 students in a physical-education class shoot at a target with a bow and arrow, and that 27 students hit the target. These 100 students are then given a demonstration on the proper technique for shooting with the bow and arrow. After the demonstration, they again shoot at the target. This time 35 students hit the target. Investigate the hypothesis that the demonstration was helpful. What additional information, if any, is needed?

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