PSAT Math Quiz
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A teacher wants to know whether a new review worksheet improves quiz scores. Two existing classes were used: Class 1 (22 students) chose to use the worksheet; Class 2 (24 students) did not. Both classes took the same quiz. The average score in Class 1 was 84, and in Class 2 it was 78. Which limitation most affects any claim that the worksheet caused the higher average score?
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