@sirgetagrip @David_LKaplan @greg_travis There is more subtlety than you are giving credit. Like did the kids have necessary equipment, did they actually sign on, are there differences in experience in terms of what curriculum was used, differences by individual teacher, etc.?
These can all be studied, may differ.
@sirgetagrip@David_LKaplan@greg_travis这里有比你所说的更微妙的东西。比如,孩子们是否有必要的设备,他们是否真的登录了,在使用什么课程、个别老师的不同等方面,经验是否存在差异。?
这些都可以研究,可能有所不同。