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 places students into the two learning-method groups by chance, helping distribute preexisting differences between the groups. Computer experience could affect how easily students use the program, so random assignment helps prevent it from unfairly influencing the comparison. The teacher and class time are the same for both groups, while the different learning tools are the variable being tested.

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