A teacher wanted to determine the effectiveness of two different learning tools — a computer program or a hands-on approach — for a particular concept she was preparing to teach. She will assign her students to one of the two methods to spend the whole class time to learn this concept. Which of the following variables would be moderated due to random assignment?

Random assignment helps balance students’ preexisting characteristics between the two groups, so differences in computer experience are less likely to explain differences in learning outcomes. Time spent in class and the teacher are held constant, while the learning tools are the methods being compared. The correct choice is computer experience.

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