4. An experiment is done with children in which their teachers in different classrooms teach the same material but they use different teaching methods. One teacher uses lectures, one teacher uses group discussion, and one teacher simply asks the students to read the textbook. Then the students all take an essay test over the material. What is the independent variable in this study? a. the test over the material b. different teaching materials 5. From number 4, what field of study or discipline uses independent variable? a. education b. psychology

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