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Nov 26, 2017 at 23:09 comment added fedja Another bad thing: they didn't disclose the actual questions, thus leaving everybody in the total darkness about exactly what skills have been tested (of course, they can claim whatever they want in the introduction in this respect, but I prefer to form my own opinions). The addition of the picture of the "random number generator" to the text makes a good laugh without doubt, but I would rather have an opportunity to look at a few other things.
Nov 26, 2017 at 16:34 comment added John Part of the issue with your study is it used randomized group membership, if students in a group are not of similar ability then they end up offloading the work on the most skilled. Also the really high pretest scores indicate they were not teaching the students something they did not already know making the assessment meaningless.
Nov 26, 2017 at 14:19 history answered Noah Cristino CC BY-SA 3.0