Professor Wii is studying whether playing video games that require mental rotation of visual images fosters success on spatial reasoning test. The best method for Professor Wii to use to be able to infer a cause-and-effect relationship would be to:
The best method for professor Wii is to randomly divide the group in two subgroups and choose one group of children to play no video games and one to play video games and then compare the spatial reasoning measure for each of the subgroup.
