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MATH URGENT!!!!

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An investigator was interested in studying the effect of taking a course in child development on attitudes toward childrearing. At the end of the semester, the researcher distributed a questionnaire to students who had taken the child development course. Questionnaires were also given to an equal number of students who had not taken the course. The students who had taken the child development course had different attitudes than the students who had not taken the course (e.g., they had more positive attitudes about having large families).

what is the independent and dependent variables?
what are the levels of independent variable?
identify one confounding variable?

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