A team of researchers want to test the effectiveness of providing high school students with a note-taking outline of each chapter that they are assigned to read in a history class. They have permission to conduct the experiment with two history classes, each containing 30 students. They randomly form two groups within each class: The experimental group receives a note-taking outline each time it is assigned a chapter, whereas the control group receives the same assignment but not a note-taking outline. On the basis of this information, what flaw have the researchers introduced into the experimental design?

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The Answer of A team of researchers want to test the effectiveness of providing high school students with a note-taking outline of each chapter that they are assigned to read in a history class. They have permission to conduct the experiment with two history classes, each containing 30 students. They randomly form two groups within each class: The experimental group receives a note-taking outline each time it is assigned a chapter, whereas the control group receives the same assignment but not a note-taking outline. On the basis of this information, what flaw have the researchers introduced into the experimental design?

A Team of Researchers Want to Test the Effectiveness of Providing