Confirmation Bias?

Teacher credential requirements maintain the mystique of the education industry. Otherwise, why not let parents decide what, where, and how their children learn? I found one class (Statistics) in the College of Education useful. Professor Ayabe suggested a year-to-year recursive grading system. Based on my experience of the useless College of Education coursework and later analysis of State-level credential requirements and State-level NAEP performance, I oppose State-imposed restrictions on whom principals may hire (aside from excluding pedophiles and other dangerous criminals).

Anyway, I am quite prepared to believe this:
Take the evidence on GPA and SAT scores. Some research suggests that these screens can predict teacher effectiveness, but the differences are small, and there’s no clear tipping point guiding states on where to set their expectations. The evidence on coursework and certification requirements is even weaker.. 

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