For those who have taken the course, do you remember taking a survey afterwards (and therefore might be included in the results)?
And yep, while I try not to be a skeptical person, I would want to read their survey procedures in compiling this information. I took a class in survey research this spring, and work as a research assistant. For someone who isn't experienced in creating survey questions, it's really easy to skew the information you gather.
PsychTau
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