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A researcher wants to test if a new 'mind-mapping' study technique improves exam scores. They recruit 50 students, have them all use the mind-mapping technique for one week, and then measure their scores on a final exam. The researcher concludes that since the average score was 85%, the technique is effective. What is the most significant flaw in this research design?
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A researcher wants to test if a new 'mind-mapping' study technique improves exam scores. They recruit 50 students, have them all use the mind-mapping technique for one week, and then measure their scores on a final exam. The researcher concludes that since the average score was 85%, the technique is effective. What is the most significant flaw in this research design?
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