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Mr. Collier - the fifth grade science teacher - feels that hair length is the element that influences science achievement. After completing one marking period - he cuts the hair of all his students and begins to keep records of their test scores in contrast to those obtained during the first marking period. Mr. Collier is attempting

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Mr. Collier - the fifth grade science teacher - feels that hair length is the element that influences science achievement. After completing one marking period - he cuts the hair of all his students and begins to keep records of their test scores in contrast to those obtained during the first marking period. Mr. Collier is attempting






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