Question: Professor Marsh wanted to know if using a textbook helped students perform better in biology class. She asked a group of students if they had

Professor Marsh wanted to know if using a textbook helped students perform better in biology class. She asked a group of students if they had access to a textbook and then looked at their average exam scores. She found that the students who said they had access to textbooks scored an average of 75% +/ 8%, and those who did not scored on average 71% +/ 7%. What can Professor Marsh conclude from this study

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