An experiment is designed to compare the differences in learning outcomes between learning math from a video game and learning it from traditional classroom activities. The experiment finds no difference between the two. Which experiment method is important for controlling bias?
A. Asking the subjects which group they preferred to be in
B. Randomly assigning students to the two different groups
C. Using classroom activities with researchers' input
D. Developing a video game with subjects' input
Answers: 3
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