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A researcher does a study of a curriculum on mass transit. She assigns a group of students from a rural school to receive the curriculum.

A researcher does a study of a curriculum on mass transit. She assigns a group of students from a rural school to receive the curriculum. She assigns a school in a major urban area to the comparison condition. She measures the results of a posttest on the curriculum. She finds that the groups score the same on the posttest. What can you conclude from this study

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